First commercial - dumb questions !

[Stu]

Hi all. Well, just received my first commercial and wondered if I could seek some enlightenment.

1) How do we date these things ? Serial number is 6349 n on barrel and frame, (cannon not marked, what parts should be ?). DWM on toggle, crown / n proof on left side of breech and germany stamped on right of cannon, gesichert safety.

2) Should the trigger be serial numbered ? Mine is marked 48 whereas the sideplate has the correct 49 on the bottom edge ?
3) the inside of the sideplate is marked 63 and the lever is marked CN +. Do we understand these marks to mean anything ?

4) The takedown lever isn't checkered and the 'button' is the same diameter as the width of the arm, (as opposed to being wider than the arm and protruding above it). Is this aftermarket ?

5) The magazine is a Haenel Schmeisser alloy bottomed police issue item. Does this have a comparable value to a commercial magazine given similar condition ?
Ah well, another voyage of discovery; thanks for any comments, Stu

Photos to follow if I can repair the camera !