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the "bintage" version is the fc-mc34. originally a triple but with the inner mounted to a custom middle ring - now a 94bcd double, e.g. https://www.ebay.co.uk/itm/196176887594
ibob
Can you not just use a triple crankset with the chainrings on the middle and inner rings? Maybe not the most aesthetically pleasing.
Will a standard shimano front mech be ok with such a big drop between chainring sizes? ie from 46 to 30?