Maybe not entirely applicable if the OPer is in Australia, but I bought a '72 PX-10 this past fall for $180. A bit rough, and the wheels were crappy 27" steel-rimmed clinchers (very likely swapped at the shop when originally purchased), every thing else original. Cleaned up very nicely, though I still haven't decided/built/found a set of wheels for it yet. $990 seems.... insane. Though perusing FB marketplace, CL, etc., I see a lot of insanely priced bikes out there.