'65 Odometer only reads 1/10th of miles?

In our '65 Valiant Signet convertible 273 Auto, the speedo works and the tenths on the odometer move like they should. However, the tenths never move the next mile digit so the mileage always stays the same. I removed the speedo and can't see anything wrong from the outside. I doubt there is anything I can do to correct the problem from here, but thought I would post this in case someone had a similiar problem/solution. Thank you.

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