Wick Humble mentions dealer posters for the Z introduction with illustrations by Yoshihiro Inomoto in his "How to Restore Your Datsun Z Car" book. The first pic is from his book, but it looks like a mix of early and late features. The hubcaps look like the 72 and later version, but with a D emblem instead of a Z, the quarter panel emblem is the later Z style instead of the earlier 240Z, and the air cleaner is an early non-flapper version.
The poster you have looks to be the same as the "clairvoyant view" from the Chassis and Body Service Manual. Maybe that is the one that Wick was referring to, but he didn't have a photo of the correct one. I think I have seen similar copies of that illustration on posters for sale on eBay, but yours is the first version of that poster I have seen.
-Mike