Wonderful progress. Morris Cowley looks right, and matches my memory of conversations about my uncle.
Interestingly, in his time as a travelling salesman, he toured Victoria by train.
The sand dunes had thrown me, but Portsea makes sense from the clues, and the nature of the group.
The family also had property at Urquart's Bluff (Airey's Inlet), and Great Ocean Rd had been built. I can think of cliffs, but not dunes.
We had one early 1950s holiday there, and took our Fiat 500 down onto a beach. We had to reverse out, and not because of that being a lower gear than 1st (they were the same). The car had a gravity fuel tank, which had to be uphill of the carburettor.
In turn, that hints at a Sunday. A typical working week was Mon.-Fri. plus half of Saturday. Hence, Sunday was the day for a picnic outing.
That was reinforced by hotels not allowed to trade on Sundays, except for bona fide travellers: defined as someone who had come more than (30 miles?, 50 km). There were processions of cars every Sunday to hotels at that radius from Melbourne. Mornington Peninsula had more attractions and more hotels, and the procession extended beyond the minimum. There is a good dvd out 'Bayside memories', which includes a few of such a procession (also bay-excursion paddlesteamers and beach scenes).
Here are two views cropped to just the car. The new one also had my uncle left of frame. It is in an anonymous treed setting. The location doesn't matter, and I would guess somewhere in the Dandenongs on another picnic.
[edit 10 min later: not the same car: the headlamp position, and also the bars in the radiator].
Terry has been driving for nearly 4 weeks without finding a photo.
Have this one to keep the thread alive.
Perhaps Terry will forego his win: whoever gets this keeps us going?
As ever, I have trouble balancing between giveaway and impossible. This is on a busy trucking route.
29.3.20: I've bumped the photo further along the thread.
When a quiz stalls, I convert it to a 20 questions approach. Don't try to guess the location. Ask a yes/no question.
I did camouflage the beer sign in this one, as too much of a giveaway. Even so, the architecture of the main building is distinctively SA.