DWM Unit Marked

[coverk]

I originally posted this in the New Collectors forum but since it is unit marked I will repost here with photos.

I picked up a DWM 9mm Luger at a gun show this weekend. It has 1920 over the chamber. Is this a property mark or date of manufacture? Serial #1508 n. It is all matching except for the Side Plate. I am not sure about the grips and the mag is a blued wood bottom with no markings but it is a period mag.

It was reblued but all corners and edges are still very sharp so it was a good reblue job. It has a sear safety and had a mag safety but that has been removed. It is unit marked. I assume a police unit.

All parts that should be strawed are blued also. Can I have comments about weather you would strip the blue and re straw the parts or leave it alone.

Also if I were able to find an 08 side plate would I be better to leave the sear safety or remove it.

By the way I paid $495 so I think I did okay