An original in an exhibit at the Hollywood Museum: http://farm4.staticflickr.c…

That is almost surely not one of the several bikes actually used in the movie though the seller shadily implied it was one by including the headshot signed by Paul Reubens along with a certificate of authenticity (presumably for the headshot signature and not the bike) and stating he is the third owner (so he can say…

Yep. It just looks like a decent reproduction.