12 at the top altimeters
This might be a techie subject but I wonder if all the experts here could help. Has anyone seem an altimeter that reads from 0 to 12 in one revolution of the dial instead of 0 to 10?. Someone at BGS has produced a shot of Yeager's cockpit showing the top half of an altimeter reading to 12 and labelled "120,000ft". Any more of these about?
Dick