Jersey experts? Billy Beane?

[JoeDfan]

I picked up this old (seller said late 80's) BP(?) jersey recently. I have bought some jerseys from the same seller on ebay, so I don't think I am worried about authenticity.

But in the tag, it clearly says "Beane". The only Beane I could find on the roster for Oakland for that time period was of course, Billy Beane (the moneyball guy I think). But baseball reference says he wore #11 for Oakland. However, I did notice that he wore #20 for two years in Minnesota.

I did find a reference that Billy attending spring training for Oakland in 1990, but was sent to the minors before the season started, which is what kicked off his front office career (if I got any of that wrong, feel free to correct me).

Does anyone know if he wore #20 in 1990 spring training?
I actually emailed the A's, but got no response.

Any information on this jersey would be very helpful.

Thanks,
Sean