1917 DWM- Match Parts Inhereted. Looking to better Identify

[BDHFM]

I appologize for the delayed response- Yep, sorry. The other DWM is a 1918 (not 1919) S#: 4967 , thats what I get for trusting my memory.

Included are some pictures of it, although not quite as good as the others. Can you reccomend the best way to identify/get info on the marking photographed in my original post?

Again, thank you very much for your expertise...