1750 GTV factory sunroof?

["Watry, Andrew (LNG-MBC)" <Andrew.Watry@domain.elided>]

I know we beat the subject to death last month of whether a 1750 Berlina
could have had a factory-original sunroof.  Now here's the same question for
a 1971 1750 US GTV. John Elrod and I looked at such a GTV for sale here in
Berkeley yesterday, billed in its ad thusly: "only 50 of this type with
factory sunroof."  
In the flesh, the sunroof was a Webasto manual sliding metal type with a big
chrome T-handle that you turned and grabbed to move the roof.  The headliner
on the interior of the roof and sunroof panel were all the same, the typical
snakebite type.  The whole headliner was a false ceiling to allow the
sunroof to slide back unseen.  There were no grab handles or courtesy lights
where GTVs normally have them, and the "headroom" panel over the rear seats
was not present.  Clear rubber drain tubes ran down the C pillars and dumped
into the rear wheels.  All in all a nice installation, but if you asked me
to judge the metalwork and installation (now 31 years old, on car that was
not especially nice), I'd have to say it was post-factory, not factory.
Have we covered this ground on GTVs already?
Andrew Watry
Berlina Register 
1967 Super posing as a shrubbery
1973 Berlina, windowless, headed for body shop today
1974 GTV covered with cat footprints
1978 Spider now with both clutch and head gasket
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