According to ads that I have seen,a Lark had a banana seat,like an old musclebike. The seat in the picture was obviously a cruiser seat just stuck on there. I believe the previous owner had thought of building the bike for his son,who at the time was only 4 or 5. The rear fender is mounted on a hoop,not tabs welded on the frame-that made me think perhaps it is a Sears model. The rear part of the frame has holes for shock absorbers on the dropouts.