I have located the 1905 coded diary that persuaded Hayek that Pigou was - for over 50 years - a Bolshevik spy.

Hayek was apparently told that the coded messages contained information about Pigou's involvement in gun-running.  Even if this de-coding is correct, the diary may still be a hoax. 

Who can decipher codes?  
 
There is a signature in the diary - it looks rather like the signature on Pigou's 1958 will rather than his signature as a young man. Hayek apparently confirmed that he recognized the signature as Pigou's writing.  

I would be grateful to have access to other versions of Pigou's signature.

Robert Leeson
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