Original 1st/only printing 22&3/4 x 28&1/2" test proof/overprint concert poster featuring assorted elements of Bonnie Maclean's art for the BG #209 (New Year's Eve 1969-1970 at Fillmore & Winterland) and David Singer's design for BG 207 and BG 208 posters (Santana, Spirit, Sly & the Family Stone, etc. at the Fillmore West) backed with a double blue pass of Bonnie MacLean's art for the BG 100/100A

 Medium glossy stock poster is in excellent to near mint (B+ to B+/A-) condition; only an ultra minor amount of surface wear/handling (a few scattered pinch dings/fingerprints), otherwise fine. A very psychedelic and unique test proof. Additionally, this one has been hand signed by David Singer in gold ink (see photo).