Dual exhaust was not a factory option on a 2v Mach 1. That is why they don't have the rear valance with the dual cutout. The original owner could have had the dealer install it, but probably would have been cheaper to just get at 4V Mach at that point.
My bad. Must be a lot of them out there that were converted to duals. Every pic I have of an H-code Mach I has dual exhaust, but no DE on their buck tags. Every pic I have of an M-code has dual exhaust and a DE on the buck tag.
"If I can't fix it, I'll fix it so no one can !"
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1969 Firebird 350 Conv - Mayfair Maze
1968 Cougar Hertz XR7-G (project)
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1963 Jaguar XKE Coupe (project)
The previous posters are correct. the H-code Mach would have had a single exhaust. The M, S, Q, and R codes came with duals.
FYI, the 1969 sales brochure mentions on page 4 "Mach 1 also has GT-type equipment like dual exhausts with the four larger engines". Then on page 14 it says "You'll get throaty dual exhausts and quad outlets with the four larger engines".
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