Odd countermark?

What’s been stamped on the face of this specimen of RRC 378/1a?  We saw a weird S very recently on this blog and in the land of twitter, but I don’t think this is the same…

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Ideas welcome. Doesn’t look much like a test punch to me….

This is not an ‘S’ but it also doesn’t look like a test mark.  The specimen is in Paris.  Red is clearly a test punch.  Blue might be a test gouge.

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This is something different again but odd as well.  Bad photo but seems Sigma shaped.

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