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That looks to be a replacement Ford item. Indicative of the "Ford" oval stamping and not the typical "FoMoCo" earlier stamping. Definitely not factory assembly line for that year. Scott Fuller makes some real nice reproduction concours quality systems. An assembly line muffler would look something like the ones in the link below from Scott's website: http://www.scottfullerreproductions.com/catalog/item/4595229/8979348.htm