Currency
The Silver Coins items appeared at the same time as Grog and Ship Materials.
Likely it was to be either part of Ship Customization or Trading.
And since there's no way to swap materials that you have for materials that you need, perhaps these other currencies were to help purchase or trade for materials you needed to finish your ships.
Like right now to finish my last ship, I still need 195 Oak. I have thousands of everything else and I tend to only find Oak at 5-10 at a time (frustrating). If such a system had been finished - items like Silk or Steel could have been sold or traded off.
And you're right, like a lot of items, NPCs and places on the map - there is a lot of unfinished business in POTCO.
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