Unknown to me, but I think it's nice looking. A wild guess, with nothing to support it, would be some kinda Mopar, maybe from the '60s. I would think that the center bullet is a modification, and that there's some kind of logo behind it.
It looks to be a made up from combined pieces cap. I think that turbine fin center was on some model of Mopar in the 60's or 70's and the bullet is aftermarket but can't id the rest of it. Looks cool though.