We have a railroad spike that was given to participants for the movie Union Pacific in 1939. There is writing on all four sides. The first is 70th. Anniversary Completion First Transcontinental Railroad. Second side is A Paramount Picture. Third side is Cecil B. Demille's "Union Pacific" Fourth side is Starring Barbara Stanwyck-Joel McCrea. I don't know what it is made from.
I have not been able to find any information as to what it might be worth, although, my husband was told that it has been sold for over $600 in the UK.
I would appreciate finding out what it's true value is. Thanks.