I have 2 identical to the ones in the original post. I got one while working at the Rod & Gun in Germany, and the other while working at a gun shop here in AZ. Got them both back in the '90s.
I always intended to frame one of them, but never got around to it. I have no idea as to their value, but I suspect it's nothing too fantastic. On the one hand, those were probably passed out in great numbers to gun shops, and perhaps to individuals at gun or trade shows at the time. On the other hand, many of those may have ended up being trashed in one way or another.
How's that for a wishy-washy answer?
(Actually, there are 4 sections on that poster...small, medium, and large frame revolvers, and semi-automatic pistols.)
Tim