Original 1st printing 14&1/8 x 20" concert poster for Quicksilver Messenger Service appearing along with the Sons of Champlin and Blackburn & Snow at the Avalon Ballroom in San Francisco, CA on 10/28-29/1966. Art by (and SIGNED in black pen by) Victor Moscoso, image ("Chicken on a Unicycle") is # 32 in the Family Dog/Avalon series. Medium-thick flat vellum stock poster has been professionally restored to excellent/near mint (B+ to B+/A-) condition; the corners have had holes filled and the lower right corner has had some VERY sharp paper repair and minor amount of in-painting (you really have to hold it up to the light to see where the work was done on this one) and there's a small amount of purple ink spread in the lower left margin (a number of these have some degree of ink spreading) and the slightest trace of handling, otherwise it's a really fantastic-looking example of this early Moscoso poster from the Family Dog with a nice fat signature.