1938 S/42 Luger

Lonnie/Juergen,

The numbers under the barrel do appear to be "8.83", just not real crisp, and again this is under the serial#. I've recently come into possession of this pistol and am not familiar with Lugers. Under closer examination I've noticed that the toggle (rear) hinge-pin has a two digit numeric code on its' left side(viewable when the bolt is pulled all the way back),and it does not match the last two numbers of the serial#--Does this mean that the toggle assembly is not fully matching? The only other viewable two digit codes that I see(on toggle) are on the two main hinge arms of the toggle assembly. Also, should the extractor have a code on it viewable from the top of the bolt on a 1938 vintage S/42? Thanks for your assistance, FTroop.