unknown

Morning all Well, any ideas what this might be? Stamped with four numbers and an ‘O’ or 0 separately on the bb Oil port, sharp rake, nice components, some of which look contemporary with the frame, others a top of the line set of early ‘60’s upgrades Arrived to be in Hammerite Blue, all original...

Please can anyone identify this? It's 15" steel aluminium, weighing in a 2.20kg. It has a 51mm ID push in bottom bracket. 26.9mm ID seat post. 33.7mm ID head tube. It has some very distinctive shaping on the rear stays and bracing on the headstock. The cable routing is notably...