David,

This is a guess, but perhaps the older ones are copies and the later model ones are the actual little book printed for Cessna.

I ordered a replacement book for my '65 model from them, and it was a copy. Not what I thought I was getting, but it'll work. Make sure before you order.

Gary Shreve
When writing the story of your life, never, ever let someone else hold the pen.
[Linked Image]