This is a 55 spitfire, I don't think it had a tank. It has painted fenders that are currently at my buddies body shop being straightened, but I think the NOS chrome ones are very cool, espicially with a set of Ace hardware's finest SS hardware!! From what I've read and seen the spitfire was the low end of the schwinn line up. I think your bike was "pimped" by the original owner. however, that paintjob was common on a few of the lower end models.
I have bontrager 2.35's on mine, but if I could choose again I would have gone with WTB weirwolfs in 2.55.