The Grail House Standard
How we ensure authenticity.
Every piece in the vault is sourced through one of three trusted channels and arrives with documented proof — so you can collect with total confidence.
Where our pieces come from
Three trusted sources. No exceptions.
Private Signings
We host and attend private signings directly with the athletes — every signature captured in person under controlled conditions.
Graphing Talent
We work with a trusted network of professional graphers who obtain in-person autographs at games, hotels, and team events.
Top Auction Houses
Select pieces are sourced from the world's most reputable auction houses, with full provenance attached to every item.
The proof you receive
Documented. Certified. Guaranteed.
Certificate of Authenticity
Every single item ships with a COA from a trusted authentication company — PSA, Beckett, JSA, or equivalent.
Photo Proof
When applicable, we include photographs of the athlete signing the exact piece you receive.