On second thought.....
It does look like a pretty small spider, and the original reference did say it was DA10... so it probably was modified for Pitch-10.... which begs the question of what the hub set-up looked like. Shimano did make single speed cassettes for BMX, so a speicial Pitch 10 cog for the same would not be a major undertaking (relative to a special freewheel).
In any case, cool and odd cranks.
Tom Dalton Bethlehem, PA, USA
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