Trivial, in the scheme of things...but I noticed today that the odometer is dead in the old girl. (W111 coupe) Speedo is happy as a day. Is that likely to be a gear inside the speedo itself, or something else?

Thanks all.

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1971 W111 280se rhd coupe (The Duchess)
1959 Bristol 406 (Monty)
1970 Volvo Amazon 131 (Lola)
Lives in Cornwall, UK.