I restore old bicycles as a hobby. Recently a friend of mine gave me my first paid project. Neither of us has any idea of what this is, but it looks to be early-50's-ish. The crank and sprocket are non-original, they were taken from an old Royce Union several years ago, so they're no clue, and the rear wheel is also a frankenstein.
I find the lines of the frame to be quite distinctive, and thought maybe somebody might know what it is. Also note the placement of the bottom bracket, I've never seen one recesses like that.