For the record, G-2 and GIN-1 are the same steel. Assuming the Police follow the same logic as other early Spydercos, yours was probably manufactured somewhere in the period from 1992 to 1994. That was when the G-2 "alias" for GIN-1 was used. Prior to that, they were made of GIN-1, but no steel markings appeared on the blade, just the Spyderco name. After that, from about 1995 to 98, they would have been marked GIN-1.