There were only 365 triple black 1970 mach 1's made. Hard to believe that black was not as popular then as today.
365 is 0.8908957773980961 % of 40,970 - so less than 1% of all 1970 mach 1's were triple black, though many were painted black instead of their original colors.
I had heard once that Ford didn't exactly encourage this color combination, though it could be ordered.
Steve