This alpha year code was first published in the hobby back in the early 1990s in Phil Wood's old Diamond Duds newsletter. It was submitted by a well-known game used collector of the era, Tim Phillips of Texas, and was first published in regards to dating Wilson MLB caps. I've never encountered an actual game used or team issued jersey from MLB or the NFL that's had an inconsistency like this. Anything can happen, but if this jersey were submitted to me for authentication, the only response I'd give would be Unable to Authenticate.

Dave M.