Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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PHS works 99.9% of the time for the '69 and later Pontiacs, dealers name and address is in the box at bottom of invoice copy. On earlier Pontiacs where IBM card was used to note car build, the zone and dealer codes are noted, and for quite a few dealers, but nowhere nearly all, zone and dealer codes are researchable online.
On a very rare occasion, there is a car that had Pontiac Motor Division use, and was eventually sold as a used car, and was discounted to the dealer. With such a deal, the copy of the invoice you get from Mattison can be the first copy, to one of Pontiac's suppliers or to Pontiac Engineering. If there is not two copies in the microfish, that's all you get. Doubt you will run into that, but it can happen.