Vinyl top?

[Gempress]

I'm very new to the mustang crowd, so don't laugh if my question seems silly . My aunt just gave me her '69 Mustang coupe with a 351 engine (she bought it new when she was a teenager) and it's still in great working order. My fiance is a professional mechanic and he and I are going to restore it.
My question is this: this mustang, while not a convertible, has a vinyl-covered hard top. I've been looking at pictures of other '69 mustangs on the Net, and I have yet to find one with a vinyl top. Why is that? Have they all been stripped of their vinyl?
I would like to keep the car as original as possible, but if there was a very good reason why there's no more vinyl-topped mustangs around, I'll get rid of it.