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That's a 541 handle, though. You can clearly see the silver ring about 8" down from the top where the straight handle grip starts, and the metal cap on the flattened end.
If it was any model earlier than a 541, the handle would be rounded off with no grip, like the wooden handle of a garden shovel. AFAIK the 541 was the only Hoover to have that particular handle -- the 543 was the first to have a curved handle-end.