If it was Texas, it would be stamped "T.D.P.S.". As a former LEO in Texas of that time period, I can say that I've never seen any D. P. S. personnel with a Model 15 or any other .38 Special. Their pistol team members were issued Pythons, and some Driver's License Troopers were issued Colt Troopers, but mostly everyone in uniform carried a Model 28. Rangers and other plain clothes officers were issued Model 19s, either in the 4" version or the 2.5" version. But no .38 Specials that I ever saw or was aware of.