I recently obtained a Carlson bike- serial #198670, 5 speed, Svelto derailleur, GB88 calipers, Sturmey Archer steel rims, Atom hubs. Top tube has a chrome sticker " Carlton Truwel " Sticker on down tube refers to Truwel 205 ERW high tensile precision tubes.Neat Carlton Worksop head badge.Frame is yellow, with green contrasts. I was attracted to the bike due to the lugs, with I believe are Crespera. Can anyone tell me more about this bike- what model, possibly when it was made. The tubes have a nice "ring " to them when you flick them with your finger nail- hope it rides well. Thanks for any info you can provide. Regards, Kelly