Posted By:
Gilbert MainesYes Vanessa, that is what you said.
Mantle's autograph on a baseball card is typically worth $200 if PSA verified.
More attractive or specialized presentations can draw larger bids.
The card which you describe, although attractive, has minimal collector value without the signature.
An offer of $200 should be reasonably safe, imo.
A greater offer would reflect your personal opinion that the item is more desireable than others.
But before you make that decision, search ebay for "Mantle Autograph PSA" and see the offerings and completed auctions.