Flightprep: a few years ago I took command of an Air Cadet squadron and inherited a cupboard full of aircraft instruments, similar to yours. During an inventory check these instruments were declared to HQ Air Cadets. About 3 weeks later I was visited by a young lady from the Health and Safety Executive, who was a specialist in radiation. She measured the radiation from the instruments and immediately impounded the lot as a health hazard. The luminous paint contained tritium in unhealthy doses.