With an angle grinder and a good set of original-looking stamping dies, that replacement block can be anything you want it to be. The collector's market for WW II Mauser rifles has that problem now, with a bunch of authentic-looking fakes that have been carefully refinished and stamped with fake "waffenampts" (proof marks) to fool the suckers!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!