David, I noticed that you have changed the article regarding the manufacturer of the dial. Instead of initially Progressia Nidau it now says Singer. You write “The 7753BT dial was made by Singer, who made the dials for the 7753 Carrera alongside Progressia Nidau.“
I actually believed that all Carrera dials were made by Singer, without ever thinking about other manufacturers being involved. Do you know if Heuer always used to have various suppliers of dials for the Carreras (i.e. the 60s Carreras like ref. 3647, 2447, 3147, 7753...)? Did the second supplier Progressia Nidau only enter later, with the introduction of the 2nd execution 2447 and the replacement of the 3647 by the 7753?
Any enlightenment would be much appreciated!
Thanks, Robert