Made by Siku from 1966-71, it is model number V255. It appeared in three different shades of metallic green. What look to be whitewalls are actually tires fitted over a white plastic insert.
Transparent plastic lever at base of cowl directs the angle of the front wheels.
It is larger in scale than the average Matchbox/Majorette/Hot Wheels, but smaller than Corgi and Dinky. I'm guessing about 1:55. My example isn't mint, but considering how rarely these seem to pop up I am very happy with mine and it is proudly displayed with my few other Siku models of contemporary American cars.