Each is a mailer 3.5x8" with folds which opens to 10.5x16" posters for post office display. Earliest is #475A from September 19, 1974 sent to Postmaster, Addison Illinois. Text states: "Above Individuals Are Self Proclaimed Members Of Symbionese Liberation Army" and warns "All Three Should Be Considered Armed And Very Dangerous." Second issue is #475AA from April 10, 1975 sent to Postmaster, Simpsonville, Maryland. On this update, William Taylor Harris has one of four photos updated. Emily Montague Harris photos are unchanged and Patricia Campbell Hearst has two added images, one a summer 1974 artist conception and the other an April 1974 photo of her as outfitted for her beret-wearing "Tonia" persona. Reverse lists cities, addresses and telephones for 59 F.B.I. offices. Trivial age traces on a couple fold lines. Overall extremely fine. Classic artifacts of our mid-70s national drama.