Original bright pink 15.5 x 23.25 poster (No. 4-1) for a series of Grateful Dead concerts at the Centrum in Worcester, Massachusetts, on April 7-9, 1988. This eye-popping poster was deliberately printed slightly off-register to give the vibrant magenta and cyan blue colors a 3-D effect. In very good to fine condition, with overall light creasing. One of the more unusual Dead posters from the 1980s, which would not look out of place in a collection of 1960s psychedelic rock posters.