The seal is a special part, almost certainly unobtainable, but the correct diameter O-ring would be perfectly satisfactory - and you may even be able to get a square section O-ring. Thickness wants to be about 1/16" or 1.5mm but is not terribly critical. Try any seal/bearing place.
I do not know of anyone who refurbishes instrument dials - some people have done it themselves though.
John


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