Ruger does not necessarily produce firearms in serial number order. 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. This number should be used as a point of reference only. Ruger Security Six, Single Six, Service Six Serial Number History 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- 150- 150- 151- 151- 152- 153- 154- 155- 156- 158- 159- 159- 160- 161- 161- 162- The above chart shows the approximate first serial number shipped for the indicated year. Beginning Serial Number: Years of Production. Standard issue service weapons of a large number of police departments, in addition.
The Ruger Security Six and its variants, the Service Six and Speed Six are a product.
