Sincerely Humphrey Bogart?
When Knock on any Door hit Welsh cinemas in 1949 local newspaper the Cardiff Times and Weekly Mail had a special promotion. They were giving away 500 autographed photos of the film's main stars: Humphrey Bogart and John Derek (future hubby of Bo).
Now I don't believe for one second that Bogey actually sat down and wrote: To all readers of the "Cardiff Times and Weekly Mail" sincerely Humphrey Bogart 500 times - presumably he did the one and it was mass copied - but whatever the authenticity of the signatures the snaps make for interesting items of memorabilia.
And 500 of these beauties are knocking around South Wales somewhere - anyone got a spare?