With a 5 digit serial, sounds like it might be a 1923 commercial. Is there a Crown/N on the toggle (left side not top), and another on the barrel in front of the serial number? Does it say "Germany" on the right side of the barrel extension? Are the 2 digit serial numbers on the takedown lever and side plate marked in the commercial style with the numbers on the bottom of each part?
Also look down the barrel (unloaded!) - does the top of the breech area (where a date normally is) look thinner than the sides?
Also you might measure the length of the barrel. Drop a pencil down there, mark and measure the length.
-- Dan
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