@AccidentalEevee asks
mine has a little stamp and the online picture doesn't. Is that worth anything extra?
Jeff answers
Possibly, but I'd identify the exact stamped release first. Then I'd look for that version in the infinitepulls.com app and compare matching sales where available. A stamp isn't a fixed-dollar upgrade. We need to know which stamp, on which card, and whether collectors seek it out.
— Jeff, infinitepulls.com