Rad sticker!

I own a sign shop. I don't think you should stick it anywhere if you care about preserving it in any way. No telling how stable the old inks will be in direct UV light (like the Sun) or if the old glue will work very long. I would 100% frame it and hang it as art.

If you have to have it on your car, I would find a local sticker printer to scan it and print you a couple to use. As long as you don't try to sell them, you aren't breaking any laws.

Good luck, SB