Rubuta ci gaba don wannan sakin layi - An buga takaddama na musamman na 1912<unk>13 Parcel Post stamps don Panama<unk>Pacific Exposition
wanda aka gudanar a San Francisco a 1915 daga matattarar da aka yi da faranti na bugawa don wannan jerin hatimin. Ana kiran su "Die Proofs" kuma ana buga su kai tsaye daga mutu a kan takarda mai laushi mai launin rawaya ɗaya a lokaci ɗaya. Bayan haka, hujjojin mutu ba su da rami a kusa da su.