It looks like a "bitsa" to me. Later tank, fenders and taillight bracket. The "toe only" shift pedal was only used in '70 AFAIK. Would be interesting to know the engine and frame numbers. With the SS1s, it should be an "A-series" Ambo. "Unrestored" - not quite. Certainly not original paint on the tank and it looks like the fork lowers have been repainted too.
And the usual question: chrome bores?