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When one of my watches was gaining like that it was all down the the balance spring coils touching each other as xzqt said. I had it gaining anything from 20 seconds per minute too a few seconds per hour. I used a balance, balance spring and bridge from another watch movement I had spare and that sorted it until I can sort out the original :) Not saying that is your prob but it was for me anyway. I could see the coils touching as the watch movement worked away.
 

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Another possibility is contamination on the hairspring, usually excess oil from the jewel. Remove the balance assembly and rinse in solvent (I use Shellite or dry cleaning fluid) allow to dry and re install will tell if that's the problem.
Rob
I've had that many times on Fusee ships clocks where the owners decided to try WD40 as a clock oil :eek:
 
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