My best guess is it's an Indian Scout or Chief from around the early 30's. The girder forks are standard Indian, there is a painting of an Indian with headdress on the tank. The engine is a flathead and the cylinders show tightly packed fins that hints at them being aluminum, not iron. The carb is poking out the left, Harleys put the carbs on the right. In those days most bikes had a foot clutch and a hand shift. Indian would put the clutch on either side you want and the rear brake on the other side. This picture shows the front brake on the left handgrip so the throttle is likely on the right hand side with spark advance on the left. Indian used to build them with a left hand throttle if you wanted it that way. The Police bikes came with a left side throttle so your right hand could do the shooting as you chased down those bootleggers. Foot boards and battery location are pure Indian. So Is the hardtail frame, Harleys are a bit different.
