How much would the 1980 new york yankees team set worth?

Cards like this really arent worth much. The guy above is probably right on. RIght now with the yankee history being "Status Quo" you may be able to get about $10 for the whole set. Cards are worth more if you had the entire 1980 set of cards from that company. Like if you had the entire 1980 Fleer set you could probably catch a $100 bucks or more. Having Tommy John may or may not increase the value of the card. It all depends on the quality of the signature, The original value of the card, and proof its really him that signed it. Photo and Certificate of Authenticity from a qualified company.