Dear all, Thank you very much. Excellent input.
Now, if I was to search for technical drawings or blueprints of these antique cars, where would I start looking? Google is no good.
Yes, and too bad about the Wawona tree (another famous drive-through tree, the Pioneer Cabin Tree, tumbled over just this January).
The car being a visitors car explains the number on the windshield, I guess. Thanks for clearing that up.