This was the original transmission from my ('74) car - it currently has a close-ratio version - & bears the serial number HA 08 10 4 which identifies it as having been built on 8th October 1974.
I have not run this gearbox personally but was assured that it was in very good condition - the car has still only covered 56k miles & this original gearbox was replaced by the close-ratio version many years ago.
£375