Back in the early '90s, a car "very similar to this" (I'd like to say that it IS the same car, but I'm not 100% sure) went to auction in Sydney.
At the time, it was owned by John Laws (yep, THE John Laws from the AM radio). Sold at auction (for a very decent price, I was at the auction), and was promptly advertised in Unique Cars mag in the following months for a hefty premium. I'm sure that's where the current owner cames into the picture (that is, IF it's the same car).
When Mr Laws onwed the car, it was hardtop only. Same Hurst shifter, same colour, same interior, car was pretty tidy.
I believe that this car would have been one of many that was imported (and converted) in the '80s by a guy named Bob Thomas (who was located on the Central Coast). He sold quite a few cars to celebrity-type people.
So, whoever buys this car, make sure you do a bit more digging and you may just find that it IS in fact a celebrity car.