Geneva ? One of world’s rarest stamps is going up for auction this weekend and could fetch a record-breaking price, the head of a Geneva auction house said.

The Swedish “Treskilling Yellow” is believed to be the only surviving misprint of an 1855 three shilling stamp that was supposed to be green. It has fabled status among collectors and is considered one of the world’s most valuable objects pound for pound.

“I’m hoping it will be a new record,” auctioneer David Feldman said Friday. He oversaw its last official sale in 1996 for $2.3 million.