Hello (again),
sorry for the long silence, I've just stumbled over this thread again and wanted to answer your question Hotspur:
I don't know if Samuel Hoppe used the SH marking. It may be possible. Another option would be Simon Helvig. I'd bet on Hoppe. But the Solingen city archives have so far not given me any answers to this question (which I was asking myself too) so far.
All the best
William
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