I just picked up a 29-5 Classic with a 5 inch barrel. The serial number has a TJB prefix and there is and identical one on an auction site with an TJA prefix. This seems way off for the manufacturing years. The box label for the TJA gun shows 10/17/1990. The SCSW4 states these guns weren't introduced until 1991. Any thoughts?
Odd numbers X'ed out on the grip frame:


Odd numbers X'ed out on the grip frame:

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