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Possibly Cuthbert Dinsdale? He is listed in Wyler as working in London in 1865-6 but no other info.
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Hi,

I've got a couple of these myself.

I think, and I stand to be corrected, that the 'hallmarks' are pretty much fake. I suspect these cases were locally made to take imported movements. Usually, they don't quite come up to the quality of British or Swiss cases.

As you are perhaps aware, this ...

'GS' is the importers mark for George Stockwell. He is listed in Priestly's 'Watch Case Makers of England' as a 'Foreign Agent' working between 1907 - 1918 from his premises at 16/18 Finsbury St., London, EC.

Stockwell's mark is particularly common on silver 'Trench' watch cases of the period. It ...