Scott #621 issued in 1925. This is a Mint PH stamp with a 2020 PSAG graded certificate. Grade: 85J og PH - "it is genuine unused, og previously hinged"
There is no listing for a Scott #621 85J in Scott Specialized, and no listing for a Grade 85 or 85J stamp with original gum and previously hinged in SMQ.
Scott 'U.S. Specialized by Grade' value for a Grade 85 is $11.00
