I have an old book entitled "Everyman's Guide to Motor Efficiency", published 1926 by the Leslie-Judge co. In the back is section containing a page with photo and specifications, prices, etc. on nearly every major make available in 1926. The info is abviously culled from factory literature and appears to be factual and complete.
I expected to see dark blue, dark green, black, and so on and was surprised instead to see "Any color desired" for the two models of Cadillac listed.