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Small aluminum container
(imgur.com)
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Could be a rosin pre-press mold.
This is almost what it is. They come in lots of shapes and sizes. This one is probably for hash coins. Seems too small for a puck for a rosin forge, and hash is commonly sold in pressed coins.
Yes, I think your right. I used a pre-press of similar diameter for a very small setup but now that I think about it, it had a chamber in the top piece like this: https://files.catbox.moe/c4tw63.jpg
Good call.
This thing is threaded though, which would be counter productive to the pressing.
I don't think the threads would impact the pressing with this design; they are outside the inner chamber.