Considering later year Giant's jerseys looked nothing like this I would say there is no chance. Giants Jerseys from the 10's and 20's were completely different. The reason the seller is probably selling over ebay and not from a true auction house is because a true auction house would/should reject this as authentic in a heart beat. There 4-5 people so far willing to take a chance...all I can say is they just don't know what they are looking at.