Found it. It's a page from the Automobile Blue Book -http://books.google.com/books?id=sNQNAAAAYAAJpage 755.but the mounting device is still uncertain... Abusive comment hidden. (Show it anyway.)
I'll bet it was used in a road rally where each car had a driver but no separate navigator. Abusive comment hidden. (Show it anyway.)
http://books.google.com/books?id=sNQNAAAAYAAJ
page 755.
but the mounting device is still uncertain...