Sometimes the world is smaller than you’d think….!
If I’m not entirely wrong, I once had this one in my possesion and sold it off at a market, most probably the “Ekeberg-market”, held by the NVK (Norwegian Veteran Auto Association)!
I was also quite fascinated by this item, believing it was from some sort of plane. I was, however, at some stage informed that this was rather a cooling fan/propeller from some sort of industrial installation needing efficient air cooling. I cannot off hand recall for which type of equipment it was used.
So, there you are, my friend; not directly aviation aviated; but a nice little story, and nice it is!
Best regards
Morten M