Beautiful frame, I've taken some interest in this!
Could be a Claude Butler frame? Lug work looks similar to this kind of design and a googling of butler sprint frames returns some similar looking work.
Other models also have similar work around the bottom bracket shell to what I can make out in your images.
Shame dropouts are horrible, and after a lot of googling I cant find a model that has those same style horizontal dropouts, seems strange they would appear on a frame with such nice lugs, perhaps these are custom? I do not know but hope this is some help...
Beautiful frame, I've taken some interest in this!
Could be a Claude Butler frame? Lug work looks similar to this kind of design and a googling of butler sprint frames returns some similar looking work.
Other models also have similar work around the bottom bracket shell to what I can make out in your images.
Shame dropouts are horrible, and after a lot of googling I cant find a model that has those same style horizontal dropouts, seems strange they would appear on a frame with such nice lugs, perhaps these are custom? I do not know but hope this is some help...