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@dmczone
I've got SR Royal pista cranks as well and they don't properly fit newer JIS spindles.
But they work with Campy and SR spindles of the same era.
It's quite possible that for the highend Royal cranks SR copied Campy right down to the taper.
And reserved JIS for the lower models.
1980's SR Royal cranksets: http://equusbicycle.com/bike/sakae/catalog18/pdf/sakaecatalog18_%203.pdf