[Daniel76]

The pistol contains nothing else indicating it saw any police service besides perhaps the grip strap marking. Police guns would normally be expected to be sporting the remains of a sear and/or magazine safety. Both of these were discontinued by the police in the 1930's, however they were still seen in various forms until the guns were captured/turned in at the end of the war. Below are pictures of them both. There are several folks on here who are very familiar with both types of markings and if I was going to bet, given the absence of any other indicators, I would say wartime unit marking.