Mid 1960s Magic Motor & box, bought new for 10/6 [52.5p] some time between 2 1965, when the instructions were printed, and Spring of 1967. It has a 186a and 186b driving band, but its 186c failed to survive into 1968. I don't promise those are the original bands, though they might be; the 23a pulley is its original. The reason it has 2 keys is that it failed within the guarantee period. There is a gear that disengages the pinion when winding up and it failed to get back into position after winding and sawed a gap in the pinion teeth. It returned with a new key in the brown box.