I already described the work by Kopal and Waldispühl on cipher letters of Emperor Maximilian II (1575) in "Habsburg Codes and Ciphers". The letters concerned are summarised in Table 1 of their paper in HistoCrypt 2021, to which the following shows record numbers in the DECODE database. (I present this as my personal note because it takes time for me to type the DECODE database name.)
R1472: Johan Kochtitzky to Maximilian II, 15 November 1574 "Letter D"
R1473: Johan Kochtitzky to Maximilian II, 22 February 1575 "Letter E"
(and in a different cipher)
R1407: Maximilian II to ambassadors in Poland and Lithuania, 23 December 1575 "Letter C"
R1412: Maximilian II to ambassadors in Poland and Lithuania, 24 December 1575 "Letter B"
R1471: Maximilian II to Johan Kochtitzky, 5 July 1575 "Letter A"
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