Is it the only piece missing? Any idea when or where it is?
Wild Rose Wheel?
You get it by doing the associated Tall Tale. I think it's what you get for unlocking all the other commendations.
Here's the wiki page if ya wanna read up on it.
Wild Rose | The Sea of Thieves Wiki
Wild Rose is the fifth Tall Tale in the Shores of Gold arc. Madame Olive is worried about the fate of the engaged couple Rose and George. The tale can be acquired from the cabinet beside Madame...
Wild Rose | The Sea of Thieves Wiki
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