Yes, yes, there are few chances that I sell my 6542, which is an almost absolute keeper.
Among the few chances, this 6542 from 1955:
Which are the specificities?
A long hour hand, the GMT MASTER in Red, and a sublime dial.
Ok, mine has a superb dial, too, but the red writing and the long hour hand are two great bonus.
Best,
Nicolas.
PS: I can't remember where I found this picture, but I will happily credit its author on request.