I haven't found any AD brochures with the NAPCO emblem shown on the truck? That's odd.
Don't know of any legit Chevy pre 55 truck brochures with actual photographs. Didn't think that technology was available or used.
The reason you've never seen "NAPCO" shown in a Chevrolet AD Truck brochures is because Chevrolet didn't make, sell or market NAPCO prior to 1957. ALL pre-1957 NAPCO's were assembled outside of Chevrolet's control as "aftermarket" third party accessories. The only place you'll see a Chevrolet AD truck with a NAPCO front end is in a NAPCO ad or brochure.
So, the 3600 badge would have been changed after the truck left the factory. There's no way the factory would know what trucks if any would be destine to get the NAPCO upgrade.
Mike B
