Check out this '39 Chevrolet featuring Holden's locally built and Oz-unique All Enclosed Coupe bodystyle aka the Sloper, which could be described as an early form of the Hatchback. In effect it was also an early predecessor of the Monaro!
1939 Chevrolet Sports Coupe - eBay Pre-1940, Collector Cars
Holden produced their Sloper designs onto a variety of imported GM chassis including Oldsmobile, Buick and Vauxhall. They were a popular seller in the pre-war era (especially the Chevrolet variant) but nowdays are rare, especially when presented in original unmolested condition as with this example.
The Sloper bodystyle with its distinctively 'hunched' and sweeping fastback roofline was also seen on a range of other locally-bodied vehicles including Ford V8s and the various sub-brands of Chryslers, along with some of the smaller Independant US marques.
Unfortunately I am unable to 'save' the 'enlarged pictures' portfolio of the e-Bay advert, to download as attachments for a permanent UCP record. If anyone is capable of doing so and can download them here while the advert remains, I would be most grateful.