mac_omega
·Just found this blog.
For interest I have an actual CK2144 watch, sub-seconds, R17.8 movement interestingly with the letter 'M' stamped on the barrel bridge, "chronometre" on the dial and confirmed via the archive extract that it was issued with a Bulletin de Marche, sold to the RAF in April 1942, it has a waterproof screwback case, and above the serial number engraved on the case back are the letters AM (Air Ministry).
Movement no. 9339968. Case no. 10105156. Inside case back 1089. Number 3 stamped on one strap lug. Back of dial Lemrich 625.
Hope this helps.
Bill.
I have sent you a private message.