Interesting, it is a 1906 frame, with commericial markings that is missing the original toggle. Older frame that has a 6 inch barrel put onto it, but an approved crown N'd barrel, but not serialed.
The 1906 w/out the 22 adapater maybe $500 (yes I am pretty sure what the frame is)
The 22 adapter is probably another $300-$400
Ed
weimar_lugers@verizon.net