Not a whole lot to add, but it seems like the effects of weather, be it wind and sand or whatever, have simply smoothed the surface, not human sanding. All mating surfaces are simply worn down.
Any further info. on where or the circumstances of the "pick-up"?
It seems fitting to wipe it down with light oil, free any stuck surfaces, and then let it live out the rest of days as an ornament.
dju
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