Good eyes rj! I was looking at the arrowheads,or "bolts" that didnt look right either and didn't see "Sile" Also,look closely at that grip frame;its too thin from back to front to even be a Detective Special(as I type,I have a 1932 rare square butt D.S. on the computer table). The frame is also SQUARE BUTT,and look at the checkered latch. Post W.W, II Colts had plain latches. YUP,its a Pre War Police Positive Special,with the "thin" grip frame,changed around 1926-28. Sile DID make replacement grips for these. The serial #36xxx puts it as a 1911 made Police Positive Special frame. All steel,replacement grips,and if you look at the other side of the gun ,stiab,I will bet you see a 2 piece screw set up holding the cylinder in place above the trigger guard.Colt changed to a single "screw" shortly after W.W. 2. Might be worth $250,if it is a good shooter,but you'd need a grip adapter with that thin grip frame,as I a had a 1920 vintage P.P. Special with a factory 3" bbl. that was worse in recoil than the later D.S. that sits before me. I guess those "extra Aircrewman barrels" were plentiful-almost like the 3" Python barrels that have been for sale for years. A helluva lot more 3" Pythons then Colt ever assembled at the factory are out there now! Be careful out there! Bud