The spare, boxy lettering style and woman in BG104 are identical to those in BG103, but the fare couldn't be more different: rocking blues vs. Big Brother & the Holding Co.
The 1st printing of the poster pre-dates the concert and measures 14 3/16" x 20 15/16".
The 2nd printing, printed on 12/14/1968 and measuring 14 3/16" x 20 15/16", contains a light yellow line running through the word "Tickets" in the lower left corner of the poster. The 2nd printing also has a 1/4" faint pink line on the reverse, which runs from the top of the poster 12" straight down.