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thinklocal
George Longstaff is a true custom builder. He would have selected the best option for each tube in the frame - with 531 as the benchmark. Over and above the standard tube sets such as 531c 531st Columbus SL etc, most of the big tube manufacturers of the time also had a large selection of individual tubes with varying profiles and gauges to cater for large and small frames and different intended uses. The very best custom builders would select every tube for a custom frame and, because the whole frame wasn't made with a 'set' of frame tubes, they didn't always add a frameset decal. George Longstaff is without doubt one of the best. If this sort of detail floats yer boat then have a read of Tony Olivers book 'Touring Bikes, A Practical Guide'.