Spoon simply marked COIN

[Gregor]

I have 6 spoons with the mark COIN on back. Any idea



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[Gold of Troy]

I have 2

Still trying to figure them out.

[silverly]

Welcome to the forum. Your spoons are marked to indicate that they are nine hundred parts out of a thousand pure and solid silver. Their style for me dates them to about the mid nineteenth century. If they are a family heirloom, it maybe possible to work out whose intitials are on the handle, but without the marking for a maker, manufacturer or retailer, I'm afraid it's going to be difficult to learn much more.