Dear M Eley
I'm a new member. Sorry to get to this thread late. I don't recognise the markings on your briquet. However, these were imported into the USA, mainly it seems from Russia. I think these may have been used in the civil war. Can't be sure. However, I've purchased a Russian example from the US recently and have seen quite a few available from there.
So it's not impossible it's a Russian import marked in the US.
Ron
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