I put "Game worn" in quotes because the eBay listing isn't too specific. Here's what the seller wrote:
"THIS AUCTION IS FOR A SCARCE PAIR OF 1960'S CLEVELAND INDIANS MAJOR LEAGUE BASEBALL GAME WORN/USED STIRRUP SOCKS. ORIGINALLY PURCHASED AS PART OF A COMPLETE 1960'S CLEVELAND INDIANS GAME WORN FLANNEL UNIFORM."
Naturally, if he/she listed a year, a player, etc., I would feel a lot more comfortable telling you these are authentic, but right now, I'll just say they look pretty real. No reserve, beautiful stirrups, go get 'em.