There is an image of the main model with three wheels.
Nice find!
Approved and added a note to the inventory.
There is a apparently new set, with torn cellophane, and its box is opened. However
I think the parts were in bags because I have two sets of photos of earlier releases
where the parts were packed in sealed bag. On top of that, we know only the early
releases from 1978-79 of certains sets were packed without sealed bags, but the
seller sent me photos of loose parts.
In the photos, we can see three wheels!
There is a catalog from 1981, probably this one:
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c81eu2 1981 Medium European (109982/110082 EU II (D/F/I)) Catalogs: 1981