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. There are occasions when blocks of serial numbers have been manufactured out of sequence, sometimes years later. Ruger does not necessarily produce firearms in serial number order. It can be used to determine the approximate year your Ruger firearm was It is not necessarily the very first serial number shipped, but This number should be used as a point of reference The above chart shows the approximate first serial number shipped for (Manufactured from 1972 to 1988) Calibers: 357 Mag, 38 Spl, 9mm Security-Six, Speed-Six, Police Service-Six Revolver
Ruger Security Six, Single Six, Service Six Serial Number History
