Don,

The shimano might be original, the seat probably isn't. Mine came with
a Viscount branded copy of a Brooks B17, rock hard and heavy as hell.
But then so is a B17, the only difference is the B17 is comfortable. The Viscount
saddle almost put me off Brooks saddles for life.
what derailleurs does your bike have? I have heard of Viscounts coming
with Shimano Crane as standard.
Yeah I'd ride it and enjoy it. every once in a while I think I should find me
one of the old viscounts to recapture some of my mispent youth. . .

Marty