NFL legend Ray Guy -- widely considered the GREATEST punter of ALL-TIME -- has been forced to sell off his three SUPER BOWL rings after filing for bankruptcy back in the spring.

61-year-old Guy -- a seven-time Pro Bowler -- banked a total of $80,100 for the three rings he earned during his 14-year NFL career ... two while the Raiders were in Oakland ... and one after the team moved to Los Angeles.

The rings (pictured above) were purchased by an unidentified buyer through an L.A. auction house.