DWM Luger? 1900ish?

[FNorm]

Yes there is a chart. Jan Still's "Weimar and Early Lugers" The R series was last 9 months or so of 1928. If they kept to a standard production rate, 4158r should have been late summer-fall of 1928.

Made in both 9mm, or 7.65 mm A difference of some $100-300. The 9 being the more desired.

Probably the most common Luger found in the USA.

FN