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Smiths rev counter
Possibly from an aeroplane as it indicates up to 3500rpm.
Marked on the dial HUNDREDS R.P.M.
X.38286
SMITHS
1-1
MADE IN ENGLAND
The dial measures 86mm to the outside of the bezel ring, the body has a diameter of 81mm.
When I remove the cover over the drive and rotate the cable connection with my fingers the needle moves to about 8 showing that the mechanism is still in working condition.