Hi,
Happy as I was when I won the shirt, I never actually got it :(
Is there any chance of claiming this prize?

Sincerely,

Marcin Petruszka

I've never seen anythng like this, but I guess what this could be used to - Looks like steel or cast iron to me, and it has those reversed letters protruding from the surface... This could be some rotating part of a press - you could turn the ring changing the numbers/letters that eventually get pressed against some softer material - paper, copper, lead.
Am I at least close? :)
Fun to do this anyway!