You will never find accurate numbers of how many have the 12/24 because it was an option that you could order or not and Rollei made them according to demand. there is also the fact that lots of people had the switch added on later. I have a 2.8F with the switch because I sent it to Harry Fleenor and had him install it. You wouldn't know the difference between factory installed or service man installed.
Re lore, Maybe we just aren't on the same page as to definition of the word. I was using it to merely mean knowledge of Rollei past. Which would include production numbers. I didn't look the word up and didn't think it would cause a reaction or discussion. Perhaps I didn't use it correctly.
Dennis