Dear David, Is that really a Hobbs Blue Riband? I always associate those rather distinctive beautifully cut lugs with this classic model of theirs and not normal bog standard Nervex style lugs which your frame clearly has. Did they Hobbs in their last throws long after they had packed up frame building buy some frames in like yours and badge them up as a Blue Ribands, or was this the last style of Blue Ribands which I have never seen before? I would say that Campag ends would be contemporary with your particular lug pattern. Very curious to know the correct answers. I am the proud owner of Hobbs Blue ribband tandem trike with the more usual blue riband ornate lugs. We ues this for tandems for the bhlind or for handicapped children Best wishes Mick.
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Michael Francis Butler
michaelbutler@fastmail.fm