I'm more interested in the heavy emphasis placed on provenance here ... "Melvyn Whittaker was a close confidant and friend of Tony Zemaitis and many of the instruments offered are some of his most prestigious and unique of all Zemaitis Models ever created by Tony."
OK, right, so this Melvyn Whittaker chap must have been a famous and successful bass player whose name attaches value to his old instruments? Erm ... no. Google has only three references to him, and 99% of those three references are the quote above, appearing in places where people are desperately trying to talk up the value of these instruments.
The other two are a single mention in a 2000 issue of Guitar Auctions (quelle surprise), in an article which is no longer available, and a not-very-good YouTube demo (presumaby for an auction) of a different Zemaitis bass which Melvyn allegedly once lent to Jaco Pastorius for possibly a single gig, possibly a UK tour, it's all very vague.
Quite frankly, on the strength of the above, attaching Melvyn's name to this bass wouldn't encourage me to spend a fortune on a grotesquely ugly instrument which (I suspect) weighs North of 12lbs.
What with Basschat being the biggest & best source of bass knowledge in Europe, presumably someone here must have known Melvyn Whittaker in his hey-day and can tell us why he has left so little trace.