Agramer overprint on piece with cancellation by the so named "mute postmark Triest". Very detailed certificate with photograph Petry BPP: "in excellent preservation. . . Island post admission stamps with this cancellation to arise from mailings, which the hospital ship "Gradisca" in the January 1945 from member the island occupying troops given to. . . Cancellations from island post admission stamps with the so called "mute postmark Triest" are rare"!