David Pearson queries "...there is reference to 'Brakes - Doherty lightweight side pull caliper' I can find no reference to this marque anywhere. ..."
the 1952 Brown Brothers catalogue lists and illustrates Doherty brake calipers and levers on page 9, in alloy and steel versions. Both have cable adjusters but only the alloy version has a quick release. Front and rear were purchased separately, and came with silver cable housing. ................ Peter Brueggeman La Jolla California USA 4peebee(at)peterbrueggeman.com