Argentina
Available here are the two stamps shown in the photos depicting Roman Catholic Pontiffs:
stamp issued on 20th June 1959 honouring the deceased Pope Pius XII (1876-1958);
stamp issued on 27th June 1964 honouring the deceased Pope John XXIII (1881-1963).
Catalogue numbers:
Michel AR 695
Stamp Number AR 681
Yvert et Tellier AR 597
Stanley Gibbons AR 942
Götig and Jalil AR 1119
Gz (Cefiloza) AR 766
Michel AR 842
Stamp Number AR 763
Yvert et Tellier AR 688
Stanley Gibbons AR 1113
Götig and Jalil AR 1280
Gz (Cefiloza) AR 872
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