Rifleman Q&A: Puzzled By S&W Revolver Markings

by
posted on June 15, 2021
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
RHKP

Q: I recently inherited a Smith & Wesson Model 10-7 revolver chambered in .38 Spl. The markings shown on the gun leave me puzzled. The backstrap is stamped “RHKP 1759.” Stamped on the butt of the grip is “AAM7024,” and there is lanyard ring. The cylinder’s crane reveals the model and another number “42917,” which, if I had to guess, is the serial number. I’ve been going in circles trying to find information about this revolver. What have I been given here?

Smith & Wesson Model 10-7 revolver

A: Your reference to the revolver’s model number is correct. It is a Model 10, which, prior to 1957, was known as the .38 Military & Police. The general design dates to 1899 and represents the longest-running model produced by S&W, and not surprisingly, it has also been produced in the greatest numbers. The frame size is denoted as “K” and corresponds to medium size. In this case, it can also be referred to as the K-frame service version, meaning it features fixed sights rather than the adjustable type as on the target models.

The “-7” in the model number represents the seventh engineering change to be incorporated into the design since 1957. I am not sure of the current “dash number,” but believe it to be in excess of “-14.” The “42917” is not the serial number, but is more likely an “assembly number” used to keep critical components matched during production. The serial number is actually found on the butt. In 1982, the pin securing the barrel to the frame was eliminated, and a three-character alpha prefix was added to serial numbers. These two features will date your revolver to 1982 or later.

Because of the popularity of the Model 10 with law enforcement entities around the globe, there is a subset within the collector groups of guns that can be identified with specific agencies. In this case, “RHKP” stands for Royal Hong Kong Police. The “1759” on your revolver is a “rack number” or some means to maintain accountability. Other features include the standard-weight barrel and lanyard ring. This version was produced around 1983, apparently in large numbers. According to Standard Catalog of Smith & Wesson, 4th Edition, by Jim Supica and Rick Nahas, some 13,000 of these models were offered as trade-ins for new firearms, and were acquired by the Accusport company for sale in the United States.

In addition to the above information, I also notice that a prior user altered the factory stocks by cutting away the upper “horns” that extended to the hump behind the hammer.
—John W. Treakle, Contributing Editor

Latest

Henry Guns For Great Causes F
Henry Guns For Great Causes F

Firearm Industry Philanthropic Efforts Endure, Despite Lagging Gun Sales

Gun sales in 2025 may not eclipse records, but the firearm industry’s generosity continues to abound, even within challenging economic circumstances.

Product : Ten21 Tactical “The Junk Drawer” Tripod Hammock

Precision shooters using tripods to support their rifles can keep miscellaneous gear organized and within reach by attaching The Junk Drawer by Ten21 Tactical to the tripod’s legs.

Review: SAR USA SAR9 SOCOM Compact

The SAR9 SOCOM Compact from SAR USA packs popular tactical features into a compact package.

A Jakl In Bullpup Clothing: Palmetto State Armory's Olcan

Palmetto State Armory adapted its piston-driven Jakl rifle design into a bullpup configuration it calls the Olcan.

150,000 NFA Applications Filed On Day 1 After $0 Tax Stamp Becomes Official

Approximately 150,000 NFA enthusiasts filed their paperwork through ATF’s electronic system in just the first 24 hours of 2026, the first day after the $0 tax stamp for most NFA items became official.

Gun Of The Week: Caracal USA CMP9K

Caracal's CMP9K pistol is based on a design originally produced to replace the aging stock of Heckler & Koch MP5s in United Arab Emirates service.

Interests



Get the best of American Rifleman delivered to your inbox.