I have a Colt Pocket Positive with a 1920 serial number on the crane and adjacent frame. In addition to the serial number, it has SPF 3 stamped on the bottom of the butt. I've seen other police issue firearms with similar markings, so I presume the SPF stands for [some city beginning with S] Police Force.
Trouble is, there are a lot of cities beginning with S. How do I find out which one? Since this gun is double-damned (.32 calibre and 3 1/2" barrel), it's not worth the price of a Colt letter of authenticity. On the other hand, it may not be a police gun after all. With a nickle finish and pearl grips, it looks more like a pimp's gun than a cop's. Although I suppose the 2 may not be mutually exclusive, especially in 1920. Of course, it could also have been re-worked after it was disposed of by the S######xx Police Force.
Trouble is, there are a lot of cities beginning with S. How do I find out which one? Since this gun is double-damned (.32 calibre and 3 1/2" barrel), it's not worth the price of a Colt letter of authenticity. On the other hand, it may not be a police gun after all. With a nickle finish and pearl grips, it looks more like a pimp's gun than a cop's. Although I suppose the 2 may not be mutually exclusive, especially in 1920. Of course, it could also have been re-worked after it was disposed of by the S######xx Police Force.