This is a distributor cap for a Scintilla Vertex magneto for an eight cylinder engine. I believe these magnetos were Swiss. This cap was made in England. Scintilla Vertex magnetos were used on some pre war Bugatti 8 cylinder cars including the type 59. They were also used on some Darracq, Delaunay Belleville cars, Riley V8s plus other makes. I think the cap may have had some use. If you would like to know more please look me up I am Graham Parsons of EGP Engines Thanks for looking, Graham. I am happy to send anywhere at an extra cost.
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