William 'Refrigerator' Perry -- Super Bowl Ring Hits Auction Block

Got a couple thousand bucks lying around? Then you could own William "The Refrigerator" Perry's 1985 Super Bowl ring ... 'cause it just hit the auction block.

It's not Fridge selling the ring -- he already unloaded it back in 2000 to a private collector ... who sold it to someone else in 2007.

Now, it's up for sale again through Heritage Auctions -- which says it also has a picture of Perry holding the ring to prove its authenticity.

As for the specs -- it's 10 karat gold with diamonds ... and it's somewhere between a size 23 and 25 -- so it's HUGE.

Good luck ...