According to the vendor and gentleman from eBay with whom I've talked to, that sells the dead on replicas (either new or aged in a chemical bath) he is the only authorized person on the planet to sell and replicate the X1 dogtags that include the words Wolverine and his associated set of numbers. He has basically shut down all other X1 replica makers on the web...single handedly. Scaring them with a lawsuit from Marvel or something to that affect. I doubt you can legally hold that design soley, just like the jacket design situation. But who knows, it's been working for him for years now.
The entire reason I have an eBay and paypal account is because of him back in '03 I HAD to have one of creations and did, but in my last house move I misplaced it. It looked sweet as hell, screen accurate and felt the part. The only issue is I wore it for about a year and a half and the ball chain acted like a saw, slowly wearing away the edges of the hole. It's not steel, as it's semi-soft, and rust resistant, but it's not pewter. He won't devulge his methods or materials. He's quite a pain in the ass in my opinion. :lol
-Tony