1918 DWM Proof Marks.?

[hansfischer007]

My 1918 DWM came in today ....and its Great....All Matching....and I put approximately 25 rounds thru it at the indoor shooting range...good crisp trigger pull...and its a tack driver......Got a mystery (at least to me) that I need you guys input on....as I said...its all matching...DWM and date on the top....however on the top right side...there are no proof marks at all..????...and its totally un messed with ....so don't understand the lack of proof marks....ive looking at a couple of other 1918 DWMs and they all show proof marks.......so let me know your opinion......by the way....the grips show plenty of use......almost worn smooth on right side for trigger finger....its definitely a combat used pistol.....anyway....let me know what you think about the lack of proof marks......Thanks..Hans Fischer