Security Six, Speed Six, Service Six Revolver
(Manufactured from 1972 to 1988)
Calibers: 357 Mag, 38 Spl, 9mm
Beginning Serial Number: Years of Production:
150-00001 1972
150-35383 1973
150-64961 1974
151-21780 1975
151-76180 1976
152-61012 1977
153-60425 1978
154-63332 1979
155-76844 1980
156-94383 1981
158-12020 1982
159-45126 1983
159-81307 1984
160-58768 1985
161-80082 1986
161-84833 1987
162-39887 1988

The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.

Ruger does not produce firearms in serial number order. There are occasions when blocks of serial numbers have been manufactured out of sequence, sometimes years later. Also, within a model family the same serial number prefix may be used to produce a variety of different models, all in the same block of serial numbers. And in some cases, models may be stored for a length of time before they are shipped.

For details on your specific serial number you may contact our Service Departments:
• Rifles, Shotguns, Revolvers: 603-865-2442
• Pistols: 928-541-8892