Two of Citizen’s largest vintage watches, measuring around 43mm across, excluding crown, are both chronographs, one automatic and one hand winding, and both feature black cases:
On the left here is the 67-9178, with the 8110A automatic movement and is nick-named the ‘Spaceman’ – my example is is missing the second markers on the outer edge of the dial. These appear to have been painted out, probably due to fading / loss of the print. The fixed greenish gold tachymeter bezel is striking. There was also a white dialled version of this one.
On the right is the hand winding Record Master Rally Custom, a sports version of the standard Record Master, with the 5702 movement. This has an inner rotating ring, used for calculating elapsed time and speed, as well as the outer tachymeter bezel.