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Originally Posted by George Hopp
Nick, would you happen to have a date for your T 19/82 (Test unit 25 Achmer fitting it [MK 108] obliquely in Me 110) George
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No, but here's how you do it … AFAIK, in the numbering of this "CX/MSS/" series of documents T = teleprint and R = report; 19 = the day it was deciphered (not the day it was sent); 82 means it was the 82nd teleprint issued by Bletchley Park that day.
OK, so CX/MSS/T 147/39 which I quoted was issued on 7 April 1944. If 7 April was "day 147" then you can count back to find what date "day 19" was. That will get you to within about 1 - 5 days of the date of origin of the message.
The date of decipherment tells you which file to search in: the NA catalogue them by those dates (the spines of the files themselves tell you the message numbers they cover as well but the catalogue doesn't).