Just touch your Räumnadel with a magnet.
Iron or steel will be attracted, bronze or copper not.
On my tool the U-shape opening seems too large for a nipple wrench, at least for the nipple now in the rifle. Drum means drum, that thing screwed into the barrel into which the nipple goes. About that term Grandpa would have been clear. Just do not know what he was thinking about this tool.
And that "buck and ball" mould that started this thread is more complex than I have seen American tools to be. From what I have seen, I think it quite unlikely for an old American mould to have folding handles.
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