Hi Bob,
Did you ever find out what this is?
A friend of mine picked one up at a junk sale just out of interest, and I said I'd look into it and found this forum.
His, where yours has the countersunk hole, has a piece of copper, thus turning it into a kind of hammer for hammering steel when you don't want to damage it. It also has '1939 KD' stamped on it.
Cheers,
Ian
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