This not true. The m code Cuda’s actually started to be built in late November early December of 68. I run the 1969 440 M Cuda Registry. Plus this is not about 69 Cuda it’s about 1968 150 speedometer.
i would certainly be interested in "learning" how many M-Code Cudas were "actually built" in late November and early December of 1968. as i'm sure you will agree, the M-Code Cudas were "1969 model year" cars only. as to the 1968 150 speedometer - do you know if any of the November/December 1968 M-Code Cuda cars were built with the 120 MPH speedometer? did the 150 speedometer come automatically with the M-Code cars?
