The Browning Sweet Sixteen has always had a little different pull on shotgun people. It is still an Auto-5, still John Browning's long-recoil design, but the 16-gauge lightweight version carries better than the standard gun and has a following all its own.
For collectors, the serial number is the first stop. It will not tell the whole story by itself, but it usually gets you into the right production era. From there, the markings, barrel, receiver milling, barrel ring, safety, and overall originality help confirm what you are looking at.
Use the Sweet Sixteen Lookup Tool
Enter your serial number in the GCC app to estimate the production year and identify the likely coding era. The tool is best for Belgian FN Sweet Sixteen serial formats, including S-prefix and year-code examples.
Quick Serial Number Reading
Most Sweet Sixteen serial-number questions fall into one of three broad groups. Earlier guns may not have the later letter code, while post-1953 guns usually become easier to place.
Pre-S-prefix guns
Early Sweet Sixteens shared the general 16-gauge Auto-5 serial sequence. These guns require more care because the serial number alone may not separate a Sweet Sixteen from another 16-gauge Auto-5.
S-prefix era
Beginning in late 1953, the letter S became the important Sweet Sixteen model clue. A serial such as S31582 belongs in this post-1953 coding period.
Single-digit year code
From 1958 through 1967, the year digit generally appears before the S. A serial such as 6S59455 points to 1966 production.
Two-digit year code
From 1968 forward, the two-digit year code appears before the S. A serial such as 71S5103 points to 1971 production.
Sweet Sixteen Serial Number Eras
| Era | Typical Format | Collector Reading |
|---|---|---|
| 1937–1953 | Numeric 16-gauge sequence | Serial number may date the gun, but physical Sweet Sixteen features must be confirmed. |
| Late 1953–1957 | S + number | The S prefix identifies the Sweet Sixteen coding period before year digits were added. |
| 1958–1967 | Digit + S + number | The digit before S indicates the year within the 1958–1967 cycle. |
| 1968–1976 | Two digits + S + number | The two digits before S indicate the year of Belgian FN production. |
Physical Features That Help Confirm a Sweet Sixteen
The serial number tells you where to start. The gun itself tells you whether the serial number is being interpreted in the right context.
- Receiver marking: many examples are marked Sweet Sixteen on the receiver.
- Lightened receiver: look for the milled cuts associated with the lightweight frame.
- Barrel ring: the lightened barrel ring is one of the practical clues collectors inspect.
- Weight and handling: the Sweet Sixteen should feel trimmer than a standard-weight 16-gauge Auto-5.
- Barrel originality: mismatched or later replacement barrels can confuse a quick evaluation.
Belgian FN vs. Later Japanese Production
This page is aimed primarily at the Belgian FN Sweet Sixteen collector problem. Later Japanese-made Browning guns can be fine shotguns, but they are a different dating question and should not be forced into the Belgian serial-number chart.
If your barrel is marked Made in Japan, use that as a major clue. The serial number format, collector market, and production context are different from the Belgian FN Auto-5 era.
Where This Page Fits in the Browning Cluster
The Sweet Sixteen lookup page should work with the broader Browning Auto-5 material rather than stand alone. If you are unsure whether you have a Sweet Sixteen, start with the general Auto-5 identification material, then return to this page once the model is confirmed.
Start with the tool
Use the app when you already have a serial number and want a quick production-era estimate.
Use the broader guide
Use the main Auto-5 guide when you are sorting Belgian vs. Japanese production or trying to confirm the model first.
About Greg Cook
Greg Cook writes about firearms collecting, personal history, and the stories behind interesting guns. His Army MOS was 76Y, Unit Armorer, and he brings that practical background to his collector articles.
Sources Consulted
- Browning Auto-5 collector references, including Shirley and Vanderlinden production-era material.
- Browning factory and collector serial-number references.
- Collector observations of Belgian FN Auto-5 markings, barrel addresses, and model-code formats.
- Gun Collectors Club internal Browning Auto-5 reference pages and serial-number guide notes.