Walter Payton RC in Beckett Vintage Collector
 

Does anyone know when this became a $1,000 card in the price guide?

What grade are you talking? NM?

I don't know these days how Beckett prices its cards but on VCP a PSA 8 of this card has been consistently well over $1,000 since Sept 2020.

There have been a few PSA 7 that sold for over $1,000 as well during the past year but they are all BINs and I don't trust those to be legit / accurate.

jeff