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Locknuts, if we could see them, might be a clue.
There is a good possibility of marking(s) on hub barrel.
If you were to have a gentle go at the ferrous oxide presently abiding thither they might choose to glide into view.
Tip for readers - have found that the drive side flanges and these large flange five-piece rear hubs have a tendency to work loose. This is not a dangerous situation as there is no place for anything to go. When they have worked loose if you lay the machine on its side, drive side up, and spin the rear wheel like a roulette wheel the gear block can be seen to wobble about ogivally.
At least three different spoke head logos are visible so rear wheel has had some attention in its dim past...
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