1965 master cylinder

Good catch eestatic. Looks like my beloved master cylinder has been replaced with something the rebuilders can get. The one I am used to had a 13/16" bore and was a real peach. Should have known that something that was only used 1 maybe 2 years wouldn't last forever. Haven't bought one since 2006 and never gave it a thought. I'll shut up about this one now. Sorry guys, looks like I was wrong to recommend this without checking further...