Now that you have it cleaned up, it’s looking more like a nesting cup weight. There are even marks on the inside like there should be. Maybe with some more research you can find out for sure. And possibly the maker to. I believe that type were used over a long time period of time 16th to 19th century. You should weigh yours and see if it matches any known weight.
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“Nested cups were primarily used by merchants to measure coins. The nested cup weights were designed to make the transport of weights, essential items in most commercial transactions, more convenient. The idea of nesting weights, which dates back to Roman times, was to increase the portability of weight sets by compacting an entire group of weights into a container. In the nested cup form, a series of weights shaped into cups are set one into the other, forming a stack which is stored within a house vessel. Each of the cups fit precisely into the next, larger sized cup, which each larger example weighing exactly twice that of the one previous. Furthermore the weight of the house was made to equal the total weight of the cup stack. In this manner, systems of weights were created that allowed for precise and flexible measurements, and could be contained within organized conveyable units.”
