Watch (French or Swiss) with visible balance wheel

Watch (French or Swiss) with balance wheel visible through a

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Watch (French or Swiss) with balance wheel visible through a
Science Museum Group
© The Board of Trustees of the Science Museum

Watch (French or Swiss) with balance wheel visible through a window in the dial

Details

Category:
Time Measurement
Object Number:
1949-55
type:
watch
credit:
Manning Haynes, H.