Giannis Antetokounmpo

What does a Giannis Antetokounmpo autograph cost?

From around a hundred and twenty dollars to the mid five figures. The floor is high for a current player because very little of his material was signed casually, and the ceiling belongs to scarce serial-numbered cards rather than to the autograph itself.

What of his gets signed most often?

Cards, and very heavily so: they account for the large majority of his market across only eight item types. This is the modern basketball pattern, where the signature arrives through card manufacturers rather than through decades of appearances.

Why is half his market graded, when older signers are barely graded at all?

Because of how the items were signed. A card autographed on a manufacturer's premises is submitted for grading as a matter of routine, so a numeric autograph grade is normal. A signature obtained at an event is examined and authenticated instead. Roughly half of Antetokounmpo's certified items carry a grade; for the convention and mail signers on this index it is under five per cent.