It is difficult to be certain whether or not Heuer actually sold any Rally Master pairs that consisted of the Master Time, with 1 through 12 on the dial, and the Monte Carlo, with three buttons. Both the later versions (1 through 12 MT and three-button MC) were introduced at around the same time (1967/68) and both models then went to the deeper / fatter case. The Master Times do tend to get switched from case to case, and it would need to be in the thinner case to match the three-button Monte Carlo (all of which were in the thinner case).

In my experience, most Rally Master "pairs" that you see on the market nowadays were put-together, long after the pieces were produced.

Jeff

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: I see a rally master with 1 2 3 4 5 6 7 8 9 10
: 11 12 on the master time and a 3 button
: monte carlo.
: Is it possible.
: On "on the dash" the monte carlo 3
: button ar always with 3 6 9 12 master time.