Is it possible that master cylinders never had an assembly date stamped? Also, I can see a faint number stamped on the machined boss at the front brake line fitting. Any ideas what that might represent? Thanks.
In the Corvette restoration world, we also see very tiny stampings on the machined boss around the front outlet, occasionally in 1968 and more frequently in 1969; that's a julian assembly date. If you look VERY carefully at the photo below, you can see a "3" and remnants of several other numbers on a '68 master cylinder boss.