Ruger Blackhawk
Identification Guide

The Flat-Top was Ruger's first centerfire single-action revolver, chambered in .357 Magnum at its 1955 introduction. The name derives from the flat-topped frame where the rear sight sits without protective "ear" guards on either side — a clean, uncluttered sight channel that gives the revolver its distinctive silhouette. In 1956, nearly simultaneously with Smith & Wesson's legendary Model 29, Ruger released the .44 Magnum Flat-Top — a revolver that has become the stuff of collector legend, with pristine examples commanding prices that dwarf virtually every other production Ruger.

Production ran from serial number 1 in 1955 through approximately serial number 39,490 in 1962, when Ruger transitioned to the Three-Screw design with added rear sight protection. Across roughly 39,000 units produced over seven years, the Flat-Top Blackhawk remains the smallest production run of any Blackhawk era — and the most coveted. Early examples with the Southport, Connecticut barrel address, original wood grips, and unfired or near-mint condition represent the pinnacle of Ruger collecting.

In 1962, Ruger updated the Blackhawk frame to add protective ear guards around the rear adjustable sight — an upgrade that distinguished these from Flat-Tops immediately on visual inspection. The name "Three-Screw" refers to the three visible screws on the left side of the frame, a configuration shared with the earlier Flat-Top but which became the naming convention for this era because collectors needed a way to distinguish it from the later two-screw New Model. This era expanded the caliber lineup dramatically, adding .30 Carbine, .41 Magnum, .45 Colt, .45 ACP (convertible with extra cylinder), and 9mm Luger variants — making it the most diverse Blackhawk production era.

Production continued until 1973 when Ruger introduced the New Model with its transfer bar safety mechanism. Old Models lack the transfer bar — the hammer rests directly on the firing pin, meaning a loaded chamber under the hammer can fire from a blow to the hammer spur. Three-Screw Blackhawks should always be carried with the hammer down on an empty chamber, the traditional "five-round carry rule" that applies to all Old Model single-actions. This safety consideration is not merely historical — it is a critical handling practice for anyone who shoots or carries an unconverted Old Model.

In 1973, Ruger introduced the New Model Blackhawk incorporating their patented transfer bar safety mechanism — a fundamental redesign that eliminated the Old Model's potential for accidental discharge from a blow to the hammer. The transfer bar only rises into firing position when the trigger is deliberately pulled, meaning the New Model can be safely carried with all six chambers loaded. The frame was redesigned with a two-pin internal architecture that eliminated one of the three external frame screws, and "New Model" was added to the left-side frame rollmarks. The transition was not merely cosmetic — it represented the most significant mechanical change in the Blackhawk's history.

The New Model prefix system (32-XXXXX through 38-XXXXX) replaced the Old Model's plain-integer and 30/31-prefix serials, providing a straightforward way to date production by prefix number. The New Model era has produced far more Blackhawks than both previous eras combined, and the line has continued to evolve with variants including the Bisley Blackhawk (1986), stainless steel finishes, the 50th Anniversary edition (2005–2006, 520-XXXXX prefix), and expanded caliber offerings including .327 Federal Magnum. While New Models are generally less expensive than comparable Old Models, early New Model production and special variants have developed significant collector followings of their own.