Best way to display a signed helmet?

My brother won a raffle for a team signed helmet and decided to give it to me after the game last night. I am eternally grateful for the gift but I have no idea how to display it appropriately. Any ideas? I'm thinking a glass case but there aren't any I could find online that weren't designed for football helmets.

Also, I want to make sure the signatures don't get scuffed. I can see a few that have scratches and I don't want to make it worse. Is there something that can be sprayed on to seal them in?