I had a look inside the locks today. Their good quality but not a best gun. No jewelling or gold. similar to a Holland type lock with intercepting sears. and Holland style flat spring ejectors in the forend.
I do not think this a very old shotgun the stock had to be made on some sort of duplicating machine its too crisp at the inside edges. Engraving is not up to best gun quality but all in all its a pretty good gun. The forend catch has a crack in the solder. Gunter Pfrommer is going to get it squared away for me