This is the printing known at FD-26-PP-6 in Eric King's guide. This was printed in London around 1970-71. It is widely believed that this was printed using the same red a blue printing plates as the official third printing. These rarely come up for sale and when they do they are usually in terrible condition.
This is a beautiful clean example and as a bonus it has been hand signed by the artist who designed it, Stanley Mouse. The item "Stanley Mouse SIGNED FD26 Grateful Dead Poster FAMILY DOG Avalon BG FD aor 1966" is in sale since Thursday, September 08, 2016. This item is in the category "Entertainment Memorabilia\Music Memorabilia\Rock & Pop\Artists G\Grateful Dead\Posters". The seller is "bryter-later" and is located in Bearsville, New York. This item can be shipped worldwide.