I corrected my observations about dating of an English cipher ca. 1700 in "Diplomatic Codes after the Glorious Revolution".
The cipher is dated "1701 July" in the catalog record of the archives, but it appeared to be merely derived from the fact that the cipher is preserved with letters from this month. So, I tried to date the cipher by examining the names included in the nomenclature entries. The entries "late King" and "late Queen" seemed to refer to King William (who died in March 1702) and Queen Mary (who died in 1694). However, there were other entries that suggest it was from the 1690s.
Now, I found the cipher was used in letters of Robert Yard, James Vernon, and the Earl of Jersey in 1699-1700. Probably, the entries "late King" and "late Queen" refer to King James deposed in the Glorious Revolution and his Queen.
Several undeciphered letters can be read by this cipher, but one (Stepney to Manchester) is in a different cipher. I included it in "Unsolved Historical Ciphers."
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