Just dropped onto this thread, parts of which appear sadly to be more suited to Faceache than a serious section of the BBS.

I assume my 604 is pretty old, though in excellent order. It carries numbers 5533 and DAT .3180 if they give any indication of age. There is no sign of cracking in the angle of the overlever and no obvious signs of wear in the barrel pivot pin. The only problem I have had, twice, is the breakage of the tiny hair spring in the trigger mechanism.

It's as accrate as an accurate thing and will forever outshoot me! (and probably most other club level shooters).