Strange serial #

Recently bought my 11th Model 24. This one is marked Savage 24V Series B. However, the serial number is perplexing and after searching threads, I haven't found where similar has been mentioned. There is a "T" in the middle of the serial. None of my other 10 have anything like that. Most don't have serials at all. I'm going to attempt to load pics. It's a little ugly at the moment. It had earlier parents. Any suggestions would be appreciated. Thanks!

OK. I need to re-read the "how to load pics." Suffice to say, here're my weapon's details:

Savage 24V Series B
222 over 20g
Color case receiver
Looks factory drilled and tapped
Serial: B637T451

Any thoughts would be appreciated.
Thanks folks!
Mac

Yeah, B637451 would be July, 1974 - but there shouldn't be a T in the middle of it. They did make the 24V in 222/20ga in 1974, so I'd say that's likely it.

That's definitely a new one on me. No clue!