Leif in Calif said "It seems like these turn up with surprising regularity...I wonder why that is. "
A Packard was more than a car. It was a trophy, a testament to your success in the world. Packard owners tended to take good care of their cars and kept them longer than most other makes.
If you bought a new "Big Three" product after the war, you would have been ready to trade it on a new one when the dramatically updated models came out in 1949. The Packard owner might have waited for the new Packard style which didn't come out until two years later, and then many people preferred the old style over the new. The class of people that were accustomed to driving Packards often had room in the garage to keep the old one that they had become attached to. Like my brother-in-law who drives only BMW's and has his '76 model, the first BMW he bought new, sitting under a cloth cover in the corner of his garage where it has been for years.
It's my observation that Franklins also survived in numbers not reflected in their original production. It's the same reasoning. Franklins, with their air-cooling, were unique when they were new. Franklin owners saw themselves as discriminating individuals and drove their cars long past the normal lifetime of their contemporary vehicles.
Don