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…No numbers!

I see the filler caps in the early machines, but I have not seen the small speedway type. Maybe this is a speedway frame? It is definitely a Bitsa bike. The Front brake looks like a ’22 and later piece and the rear wheel seems to be for some of the earlier machines with a brake on the right side and sprocket on left.
I see pictures of the parts in the books I have been reading in the past weeks.
– The radiator as you say is later model yet with dual upper tank flanges
– The engine is 1914-15
– Bosch magneto
– Amal brass carburetor
– Dual exhaust pipes on either side AND an outlet in the center for exhaust on the engine barrel
– Seat springs mounted on cross-bar welded to frame like the later motorcycles without oil in frame
– fuel tank? Maybe ’15 but does not fit the frame (too tall)
– Small oil filler cap in place of sidecar lug – aprox 1″ in diameter
– Scott front forks with guides (as far as I can tell)
– Front fender is in between the early thin type and I think 22 and later valanced type. It has provisions for the fork
– Front fork has lug for front brake arm

Are there any distinguishing features I should be looking for on this frame?

I acquired this bike with a heavily modified ’30 Rep and found through the seller these bikes were raced by the previous, previous owner. I assum this bike has been built up from war time pieces or maybe was new only to have all of its bits swapped for the more favorable (in owners opinion) parts for racing.
It looks like the project stalled when the 3 speed transmission was installed.