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What movement is this please


Cyanide

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My friend inherited this watch from her grannie. It is hall marked London 1915 by George Stockwell, but the movement is marked as Swiss. The makers mark is a heart, in a shield, with a smaller diamond above. Does anyone know who this is?

also, for the filthy dial, I'm going to try rodico first to clean it up, any advice if that's not effective? A bit of patina is acceptable, but this is just dirt!

 

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