Somerton Man, The Innocuous Letter Card or was it more than that?

In the suitcase found and associated with the Somerton Man, amongst numerous other items there were some 'Lettercards' these ones of course were the Australian version and the one above is similar to the ones found.

The question is not was this a genuine lettercard, but how could it have been used?

In one of the pages, Secret Writing, there is a document that you can download, it was released in 2011 by the CIA. It talks of microscopic writing and how, using orange colored ink, an agent could write a secret message across the stamp and it would not be visible to the naked eye unless you used a ruby colored lens. This had the effect of making the stamp invisible and the writing clear.

This same document also tells us about the use of any lines found on a document, within them it states, you could 'hide' Morse code' or in the Somerton Man case it could be micro writing hidden within lines or flourishes or even larger letters. There were and are people around who could with the naked eye, write letters as small as .1 mm in height. Look up James W. Zaharee for more on this.

Here's a question for you, on the example lettercard above and if you were a spy, where could you write and hide secret messages?

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