I'm not sure I'd spend $50.00, much less $200 for an old paint chip book. I'll defer to Martin on this, but I'll bet that the colors in that book are shifted from age, especailly the reds, which are so hard to match. The chances that they really represent the color of a 1941 original color are slim to none.
We have a hard time matching two and three-year old paint colors, even in the areas not exposed to the sun, much less the dust, fumes and gunk floating around in a body shop for the last 60 years.
Even if they were dead-bang on, some goof-ball at a car show would still get in an arguement with you over the "correct" color. There's a reason that "good enough" is good enough. I subscribe to the Shaker philosophy. Everything that a man makes will have a flaw, as only God is perfect.
Get as close as you can and enjoy your work, everything else is wasted effort better spent on the next thing on the list.
That's my 2 cents worth...but I could be wrong.