Originally Posted by
Howard
Bought a Sports frame at the Indiana swap meet today. No wheels, fenders, just a frame, BB, crank, pedals, fork, headset, stem and handlebars - all the oddly threaded parts, in other words.
All the decals are long since faded away, as is the paint on the head badge (which was still there!).
The serial number is 5 digits at the top of the seat tube with AK under it, which sounds at first like a 1960's frame, but ...
It has a BB oiler, chaincase braze on, and the simpler lugs ... So now I'm thinking earlier.
(from the headbadge.com: convention 2: 1948 .....AJ through .....AP (?))
Not real positive, but I seem to recall that 1955 was the last year they used the oiler bottom bracket, so your frame has to be earlier than that.