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Overuser155208
@clubman
'Amalgam' in the context of Dayton means, I think, 'flash butt welded'. I believe the frame tubes were mitred, pressed together and then had an electric current passed through them which welded the whole thing together. This gave a fairly neat looking result; a lot of these bikes were bought by parents of boys who had passed the 11 plus in the 1950's.
But, a lot of these did not last out the boy's school career because the welds often broke. Perhaps it depended on how accurate the mitres were - they didn't all break. The one you're looking at has lasted about 70 years, so maybe it's a good one.