Have a Glock 19, date of birth July 1988. S/N #BPxxxUS. From what I've read, the G19 was first introduced in 1988, but mine is not on a GEN I frame. It also has Austrian Proof Marks on Slide, Barrel and Frame. Would anyone have any information about this pistol? Is this an "oddball"? Thanks. Wanna kill these ads? We can help!