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@Amaz'in
There is..with a bit of digging a review of the tubing in the form of a two Machine test from an American Magazine..I am certain they built two identical frames..one from 731..and the other may have been Columbus El o/s or was it a later Columbus tubeset?
I researched it when I picked up a 731 o/s race bike I have here.(along with a EL o/s bike too).
J