The hardest part of dating a Colt Police Positive is not reading the number. The hard part is choosing the right serial-number sequence before you start. Colt used separate ranges for different Police Positive branches, and a revolver marked simply “Police Positive” is not automatically a .38 Special Police Positive Special.
This guide is written for collectors who need a practical date-of-manufacture estimate from a serial number. It includes separate tables for the standard Police Positive .38 and Bankers Special sequence, the Police Positive .32 and Target sequence, the Police Positive Heavy Frame sequence, and the long Police Positive Special / Detective Special sequence. Use the tables as a starting point, not as a substitute for a Colt Archive Letter when provenance, value, originality, or a premium claim is at stake.
Important: These tables give approximate production anchors. Colt’s own serial-number lookup describes its result as an approximate date and points collectors to Colt’s Archive Department for complete firearm history. For a serious gun, an engraved gun, a police-marked gun, a rare shipment, or a sale listing that depends on a specific date, factory documentation is the better standard.
Collector Series
Colt Police Positive Series
The Police Positive pages now work as a single collector series: start with identification, follow the timeline, date the revolver, then evaluate value and provenance.
Start with Colt’s official serial-number lookup. Before comparing your revolver to the tables below, enter the serial number in Colt’s own database. It is the fastest first-pass check for a year-of-manufacture estimate, especially when a serial range overlaps more than one Colt model family.
Treat the result as an orientation tool. Colt notes that lookup results are approximate and that definitive documentation should come through Colt Archive Properties when the firearm’s history, value, or provenance matters.
Quick Answer: Which Colt Police Positive Table Should You Use?
If the revolver is a standard Police Positive chambered in .38 Colt New Police / .38 S&W, use the Police Positive .38 & Bankers Special table. If it is a .32 Police Positive or Police Positive Target, use the .32 & Target table. If it is a Police Positive Special, Detective Special, or related longer-cylinder D-frame in .38 Special or .32-20, use the Police Positive Special & Detective Special table.
Standard Police Positive .38
Usually .38 Colt New Police, Colt’s name for the .38 S&W-class chambering. Do not assume .38 Special merely because the barrel says .38.
Police Positive .32 / Target
Use this path for .32 Police Positive and the Target branch. Target revolvers can deserve special attention because sights and configuration affect collector value.
Police Positive Heavy Frame
A short production sequence from the mid-1920s into the mid-1930s. Heavy-frame guns belong in their own table.
Police Positive Special / Detective Special
The long D-frame sequence used for the Police Positive Special and Detective Special family. This is the table many collectors need for .38 Special guns.
Before You Date the Gun, Identify the Model Family
The Police Positive family is a trap for casual serial-number work because the words sound simple and the frames look related. The standard Police Positive, Police Positive Special, Police Positive Target, Bankers Special, and Detective Special share Colt history, but they do not all share the same serial sequence, chambering, cylinder length, or collector meaning.
Colt’s Police Positive story grows out of earlier double-action and police revolver work. Colt’s own timeline places the Model 1877 at the start of its double-action revolver legacy, the Model 1889 Navy as its first double-action swing-out-cylinder revolver, and the 1896 New Police .32 as the first standard-issue revolver selected for the NYPD by Theodore Roosevelt. The Police Positive sits downstream of that development, not apart from it.
American Rifleman describes the Police Positive debut in 1907 and explains that “Positive” refers to Colt’s internal hammer-block safety. The same article explains that the original Police Positive added .38 Colt New Police, while the 1908 Police Positive Special used a slightly lengthened frame for longer cartridges such as .32-20 WCF and .38 Special. That is the key serial-number lesson: the standard model and the Special are related, but they are not interchangeable.
Field rule: Read the complete barrel marking, confirm the chambering, record the serial number exactly as stamped, and then choose the table. A bare statement like “old Colt Police Positive .38” is not enough information.
Where Is the Serial Number on a Colt Police Positive?
On many Colt swing-out-cylinder revolvers, the serial number is found on the frame under the crane when the cylinder is opened. Related assembly numbers or inspector marks may also appear in the crane area, on the crane itself, or on other parts. Do not confuse every number you see with the firearm serial number.
For documentation, photograph the number straight on, with enough surrounding metal visible to show location. Also photograph the barrel marking, cylinder, butt, grips, sights, and any box label or shipping paperwork. When a revolver has a police department marking, retailer mark, engraving, unusual finish, or family provenance, keep those photos together with the serial-number research.
Dedicated Serial-Number Tables
To make the guide easier to use and reduce repetition, the complete annual tables now live on focused pages. Choose the model family first, then use the matching table.
Standard Police Positive .38
Standard .38 Police Positive and Bankers Special annual anchors.
Open focused table →Police Positive .32 / Target
.32 Police Positive and Target model production anchors.
Open focused table →Police Positive Heavy Frame
Short Heavy Frame sequence from the mid-1920s into the mid-1930s.
Open focused table →Police Positive Special / Detective Special
The long D-frame sequence used by many .38 Special collector guns.
Open focused table →How to Read the Tables Without Overstating the Date
Most serial-number tables are anchor tables. They usually show the first number, an annual starting number, or a representative production point for a year. That means the table helps you estimate where the gun falls, but it does not always prove the exact day, shipment date, retailer, destination, finish, barrel length, or configuration.
For example, a serial number that falls between the 1924 and 1925 anchors may be described as a mid-1920s gun or a likely 1924–1925 production range depending on the table structure. But if you are writing an insurance schedule, selling an expensive revolver, or documenting a department gun, the better phrase is “serial range suggests” until factory documentation confirms the shipment record.
Use the Colt database first, then use the tables as a cross-check. Colt’s lookup can quickly confirm whether your serial number appears in the company’s online records. The tables on this page are useful when you are comparing model families, checking older published ranges, or trying to understand why a number may appear in more than one context.
Better wording: “Serial range suggests 1920s production” is safer than “made on a specific date.” A Colt Archive Letter may give shipment date, original destination, barrel length, finish, stocks, and other recorded details when records are available.
Police Positive vs Police Positive Special: The Common Mistake
The most common collector mistake is treating a standard Police Positive as a Police Positive Special, or the reverse. The standard Police Positive in .38 Colt New Police / .38 S&W-class chambering is not a .38 Special revolver merely because the model name contains “Police Positive.” The Police Positive Special was changed to accommodate longer cartridges such as .38 Special and .32-20 WCF.
That difference affects more than shooting. It affects the correct serial table, the correct collector caption, and sometimes value. If the chambering is unclear, have a qualified gunsmith inspect it rather than relying on internet shorthand. Never use ammunition assumptions as a dating method.
When a Colt Archive Letter Is Worth It
A serial table is enough for casual orientation, but it is not enough for every claim. A Colt Archive Letter becomes more attractive when the gun has unusual markings, unusually high condition, engraving, nonstandard barrel length, a scarce finish, a desirable shipment destination, a department story, or any claim that changes the price.
Colt describes its Archive Letter as a service where Colt historians search factory archives to provide documented details confirming original specifications and delivery information when records are available. That does not mean every letter will contain every fact a collector wants, but it is still the strongest path when the value depends on documented history.
Serial Number Verification Checklist
- Record the serial exactly: Include prefixes, suffixes, spaces, and any letter characters.
- Photograph the location: Show the number in context so later readers know which marking you used.
- Read the barrel: Model and chambering markings determine which serial table applies.
- Check cylinder length: Standard Police Positive and Special-family guns are not the same path.
- Compare features: Grips, sights, topstrap, ejector-rod treatment, and finish should fit the estimated period.
- Watch replacement parts: Grips, barrels, cylinders, and sights may have been changed during a century of use.
- Use Colt records for premium claims: A table estimate is useful, but a factory letter is stronger evidence.
Collector Takeaway
The Colt Police Positive rewards careful research. The revolver looks simple, but the serial-number work is only reliable when the model branch is identified first. A standard .38 Police Positive, a .32 Target model, a Heavy Frame, and a Police Positive Special may all feel related in the hand, but they belong in different serial-number conversations.
Use the tables to orient the gun. Use the markings and features to test the table. Use Colt records when the story or money is serious. That three-step method will keep your captions more accurate and your collection records more useful.
About Greg Cook
Greg Cook is a CPA and firearms collector who writes about gun collecting, history, provenance, ownership impressions, and the practical details that make individual firearms memorable. His Army MOS was 76Y, Unit Armorer.
Sources Consulted
This collector guide was prepared by comparing factory resources, historical firearm publications, archival serial-number references, and Gun Collectors Club photography and notes. The production tables should be treated as collector reference anchors rather than factory shipment records; when value, provenance, originality, or a premium claim matters, Colt Archive documentation remains the better standard.
- Colt Serial Number Lookup — official first-pass factory lookup for approximate date-of-manufacture orientation.
- Colt Archive Services — factory-letter resource for documented shipment information and original configuration details when records are available.
- Colt Timeline — factory historical background on Colt double-action revolver development and related company milestones.
- ProofHouse Colt revolver serial-number archives — collector serial-number reference material compared against the tables and model-family notes in this guide.
- ProofHouse Colt target and small-frame reference material — historical collector data consulted while reviewing Police Positive .32 and Target-era production anchors.
- ProofHouse Colt Heavy Frame reference material — archival serial-number reference used for comparison with the short Heavy Frame production sequence.
- ProofHouse Colt D-frame reference material — collector serial-number archive consulted for Police Positive Special and Detective Special family ranges.
- American Rifleman historical coverage — background on the Police Positive family, Positive Lock context, chamberings, and related Colt D-frame development.
- American Rifleman collector feature — additional historical and collector context for the Police Positive family.
- American Rifleman valuation feature — market and collecting context for the Police Positive Special branch.
- Gun Collectors Club: Colt Police Positive Guide — companion GCC identification article for production years, issue changes, and Police Positive family context.
- Gun Collectors Club: Colt Police Positive Timeline — companion GCC timeline for placing the model family in chronological order.
About Greg Cook
Greg Cook is a CPA and firearms collector who writes about gun collecting, history, provenance, ownership impressions, and the practical details that make individual firearms memorable. His Army MOS was 76Y, Unit Armorer.