It may be worth sitting on your fully loaded bike with some one ( or thing ) blancing you, then check the free play, chains usually only break when over tightened, it wont do the gearbox output shaft bearings any good either. As has been said, maybe a poor quality chain.
I would expect a chain in the sixties to last for 8-12 thousand miles. Presumably the new ones with the x or o rings are better.
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