Security-Six, Speed-Six, Police 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 necessarily 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, firearms may be stored for a length of time before they are shipped.

For details on your specific serial number you may contact our Service Department: 336-949-5200

For serial numbers manufactured prior to our electronic records, or for an official letter confirming the details on your firearm please download and mail in the Request for Letter of Authenticity form.