Bill , how you found what you did makes perfect sense and it's great to see the proof in the pics !
Two points though ... Why would they have put a number on the block and then covered it with the grey bilge finish ?
Secondly .. even though mine was also the original grey finish as well inside , on the St T the bow eye is mounted right smack up against a small glassed in V shaped mini bulkhead where the bow lifting eye threaded rod is bolted to.
Assuming that the bulkhead is installed while the boat is still in the mold it would take a contortionist with a very strange pen to write a number on the block.