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Same symptoms can develope due to moisture damage to electronics.
This caliber might be obsolete, in case exploded view of the movement is not available and you decide to attack this yourself, take pictures at every stage of disassembly.
At the very bottom of the page in the link on the right side. The last one. On my screen it shows up as (RWA) A-29418-5
Rheostat, 800 ohm, 50 watt, 0.25 amp. Type R-50. 2-1/4" diameter body, 1-3/8" behind panel depth. 1/4" diameter x 1/2" long round shaft. Made by Memcor. NSN: 5905-01-013-4370.
Dave said this one is close enough it should work. One thing I noticed is the wattage. it's 50 watt and the machines are rated at 60. Also the amperage, seems low. Can't remember what the machine runs at.