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Paul, the only things I could see clearly in the pictures are the lack of number plate brackets on the rear diagonals and the lacke of a rear seat support loop. One of the other really easy ones is if it has the gusseting box on the front frame tubes below the steering head. The street frames had it and the Manx frames didn't. Less obvious, at least at first glance, the Manx frames were all Sifbronze welded (brazed, if you prefer), while the production frames were all electric welded. Even less obvious, the radius at the rear of the top main frame tubes is larger on the Manx than on the production frames. Another fairly obvious one is that Manx frames had a full rear loop behind the seat with a bracket for the fender, which the production frames did not. There are probably other differences, but these are the ones that I recall.Ken
Paul, the only things I could see clearly in the pictures are the lack of number plate brackets on the rear diagonals and the lacke of a rear seat support loop. One of the other really easy ones is if it has the gusseting box on the front frame tubes below the steering head. The street frames had it and the Manx frames didn't. Less obvious, at least at first glance, the Manx frames were all Sifbronze welded (brazed, if you prefer), while the production frames were all electric welded. Even less obvious, the radius at the rear of the top main frame tubes is larger on the Manx than on the production frames. Another fairly obvious one is that Manx frames had a full rear loop behind the seat with a bracket for the fender, which the production frames did not. There are probably other differences, but these are the ones that I recall.
Ken
