I mentioned Emperor Charles VI's letter partly in cipher in "Habsburg Codes and Ciphers", based on materials presented by Jakub Mírka. Now machine translation allows me to more or less read his paper, Jakub Mírka (2012), "The early modern cipher correspondence in the noble family archives deposited in the State Regional Archives in Pilsen" (ResearchGate) (in Czech according to Google Translate).
The letters are from Emperor Charles VI to Leopold Viktorin von Windischagrätz in the Windischgrätz Family Archive in the State Regional Archives (SOA) in Pilsen (in the Czech Republic).
One was sent when Leopold Viktorin stayted in The Hague as an envoy.
3 February 1720 (DECODE R5020; original R5019; key R5017)
Interestingly, the Emperor informs the recipient that the new cipher would be supplied in this or the next despatch to be used exclusively with him, while the old one would be used with the court office.
Other letters belong to the period when Leopold Viktor served at the congress in Cambrai (VUB).
13 April 1720 (DECODE R5022; original R5021; key R5018)
24 July 1720 (DECODE R5023; key R5018)
11 April 1722 (DECODE R5024; key R5018)
Another undeciphered letter interesting to me mentioned by Mírka is one from Johann Wenzel, Count of Gallas (Wikipedia), imperial ambassador in London, to Prince Eugen of Savoy in 1711 during the War of the Spanish succession. He says this is supposedly important.
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