A group of seven gold bars which have pictures and text in Chinese, script and cryptograms which appear to represent certificates relating to a deposit with a US bank in the 1930s.

Further information including images of the scripts and pictures can be found here on the International Association for Cryptologic Research site [1] and the Cipher Mysteries page [2]. There are a number of other webpages on the subject, many of which repeat more or less the same information.