The 4WD wagon was first put in production in 1972, but introduced to the US in 1975.
The first car, the 1500 (above) of 1954, was a conventional sedan.
And like many early FWD cars, the 1000 used inboard drum brakes at the front to reduce unsprung weight.
How Subaru came to be so heavily associated with 4 wheel drive was, like so many things, an accident, and not the result of market research or focus groups.
By conservative Japanese standards, it was a breakthrough; the first mass-produced FWD car.
A true clean-sheet approach resulted in what almost every engineer would favor if not constrained by other factors: a very compact boxer four mounted low just ahead of the driven front wheels.