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It's ISO I doublechecked, it's an old MTB one, ProLogic in 109 width.
I also have a Gran Mighty ISO crankset on a Miche JIS with 0 problems.
#puzzled :)
Sugino 75 in good nick on a Ritchey vintage NOS BB... the tapers match (ISO on ISO)
I don't see how it could be worn. But you could be right, there could be something worn or not OK. I'll check :)