I have original illustration from National Lampoon July '72 article
"The way to become the masculine he-man". Illustration credited to
Vincent Calabrese. The back of the drawing lists his address as
Briarwood NY. Is this the same artist that is now a master watch/clock
maker?  I have not found any biographical info on him prior to 1977.
If it is, How can I authenticate this? Is there an appraisel service
that specializes in this type of work?

Vicent Calabrese is a watchmaker in Switzerland, so I doubt it is the
same person.  But if it's a nice piece of National Lampoon art, it
could be worth a couple of hundred dollars.  You can auction it off on
eBay or contact http://comics.heritagegalleries.com/ to auction it off
for you.