This was acquired as a digfind and it showed evidence of being cooked in a quite considerable way.
There were enough traces to identify it as a 1920 property-marked WW1 DWM pistol, which had been an LP08 in it's earlier life (reads like 1915). Last 2 digits are '11'. Number on receiver reads like 1511. No sign of additional numbering on the frame.
What the frame does show is the faint remainder of a unit marking. After further cleaning it reads as P.W.? (where ? is a number).
Any comments on the unit marking are greatly appreciated, as are comments on the date marks in combination with the serial number.