I have been helping the widow of an old chum of mine to dispose of his collection of aircraft and aviation related photographs on a well-known auction site. Some are of Soviet warships and date from his time on
PR Canberras. Three carry the printed inscription across the bottom "...Confidential US/UK Eyes Only", with a date in 1970.
How do you think I stand on these? My feeling is that they must have been long declassified, particularly as the ships must be razor blades by now, but I'm not keen to get a visit from the guys in a car with blackened windows.
Anyone know how long these security classifications last?