Going by the forks, it's a 70-71 Lil Indian, can't tell if the frame was originally a single speed bike or two speed because there are remnants of brake mounts on both sides. 1969 is when they started using Tecumseh engines and also putting the hole in the engine plate. The 69 bikes had a bend in the forks about and inch over the top triple tree plate whereas the 70-71 the bend was just above the plate like yours. The scrub brake was added, the original disc brake parts are hard to find, expensive and don't really work that well once the pads get loaded up with oil from the chain so many people tossed them in favor of a clutch brake or a scrub brake.