Re: First Post - need help to identify
Good search, Danno and a good find.
You have a very nice and important pistol.
If I may, I would like to add to what you have already learned....
The complete inscription may be ''POTTSDAM MAGAZIN'' and the contractor/maker is shown by the small inscription on the edge of the lockplate - three characters indicating S and D or Splitgeber and Daum.
The engraved brass thumb plate bears the monogram for FR which is ''Friderius Rex'' whom we know as Frederick the Great. With this monogram, it is safe to suppose it was manufactured in his reign, 1740-1786.
There is a possibility that the actual date of manufacture is also on the lockplate - but hidden beneath the finial of the frizzen spring.