Bill Graham postcards were produced with several different back types: Place Stamp Here (PSH), Advertising backs, Blank backs and Bulk Rate Permit backs (as well as combinations of these types in the case of double sized cards). Many cards were produced in more than one back style. The Ad backs and Bulk Rate backs were used to advertise the shows. They are generally harder to find and more valuable than the PSH backs which which were produced for retail marketing. However, please note that Ad back cards were not produced prior to #119.
(See also: Fillmore posters