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It must be inspired by them mustn't it. I think Columbus must have knocked a few SL tubesets with these shaped main tubes and dropped stay rear triangles out as there seems to be a small number about that look exactly the same, although I think that particular MBK might be made from their own tubing. I had a pinky-purply sparkle one that I sold here that would have built up superbly and a very nice bargain!
Would love to know more about Chris Marshall; believe he was based around Leeds way so within a good racing scene.
Is it an MBK under the paint? Always fancied a Trainer as a knockabout bike: