According to Gortz & Sturgess, the DWM toggles ended at approximately 1500 ~ 1550 in the v suffix range.
They do note, however, that BKIW did a final clear out of all old DWM parts in the late 1930's - as stated by Dwight - and that raises the question of an odd DWM toggle being used as late as the y suffix range. It would require a hands on examination of the Luger in question to determine if it's an all matching original or something else.
I'd ask the seller for a better picture.
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