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There typically is no marking at all on the single exhaust 64-66 V8 mustang mufflers, although the service replacements may have markings. The only thing we see on originals is an engineering number stamped into the tail-pipe end.
Also a 64.5 wouldn't have had a resonator .
Here is a shot of the underside from the front. Note no resonator.
the green 64 1/2 coupe in question might make its way to Australia sometime soon hey Mr Murray!!!!