[DonVoigt]

If the wood based mag was servicable, it would have add the markings added upon entering police service, the aluminum base dates to around 1930, and may have been added at the time of the addition of the sear safety.

Thanks for the picture of the left side, but the area of the frame at the top of the grip is too dark to see much. I'm looking for about a 5/16" hole above the trigger but under the side plate, where part of the magazine safety would have intruded into the mag well.

In the first picture, you can see the hole, but the mag safety is removed; the other three(a different pistol) show the magazine safety in place and with the grip in place also.

The mag safety did not work really well, and they were ordered removed or incapacitated in 1936-7. An intact safety is rare, some were removed completely, some only partially.