Earliest Reported Postmarks

Here are scans of some of the Earliest Reported Postmarks (ERP's) of the Republic. Obviously several, such as the 1936 Matanzas issue, were issued on the same day so it does not make much sense to have an ERP for those issues.

ESCUELAS Y CAMINOS SON BASE / DE PROGRESO
ESCUELAS Y CAMINOS SON BASE / DE PROGRESO. ASISTIENDO A AQUELLAS Y CONSERVANDO ÉSTOS / SE CONSOLIDA LA PATRIA
Slogan 2 — 16 March 1926 — Rudy Roy collection
COMPRE PRODUCTOS DE CUBA
COMPRE PRODUCTOS / DE CUBA / PROTEJA LA INDUSTRIA / NACIONAL
Slogan 3 — 17 July 1926 — Robert Littrell collection
COMPRE AZUCAR CUBANO / Buy CUBAN SUGAR
COMPRE AZUCAR CUBANO / Buy CUBAN SUGAR
Slogan 4 — 2 March 1926 — Robert Littrell collection
COMPRE AZUCAR CUBANO / BUY CUBAN SUGAR
COMPRE AZUCAR CUBANO / BUY CUBAN SUGAR
Slogan 5 — 30 October 1930 — Mark Tyx collection
FUME TOBACCO CUBANO QUE ES EL MEJOR DEL MUNDO
FUME TOBACCO CUBANO QUE / ES EL MEJOR DEL MUNDO
SMOKE CUBAN CIGARS / THE BEST IN THE WORLD
Slogan 6 — 31 August 1926 — Robert Littrell collection
VISITE CÁRDENAS Y SU PLAYA DE VARADERO
VISITE CÁRDENAS Y SU PLAYA DE VARADERO
Slogan 9 — 16 March 1928 — Mark Tyx collection
QUIEN MAS NOS COMPRE NOS VENDERA MAS COMPRE AZUCAR CUBANO - OUR LARGEST BUYERS WILL BE OUR LARGEST SUPPLIERS BUY CUBAN SUGAR
QUIEN MAS NOS COMPRE / NOS VENDERA MAS / COMPRE AZUCAR CUBANO
OUR LARGEST BUYERS / WILL BE OUR LARGEST SUPPLIERS / BUY CUBAN SUGAR
Slogan 11 — 14 January 1929 — Robert Littrell collection
CUBA ES EL PARAISO DE LOS TURISTAS - CUBA IS THE PARADISE OF TOURISTS
CUBA ES EL PARAISO / DE LOS TURISTAS
CUBA IS THE / PARADISE OF TOURISTS
Slogan 12 — 10 December 1928 — Robert Littrell collection
1833 - 1933 FINLAY - LIBERÓ AL MUNDO DE LA FIEBRE AMARILLA
1833 - 1933 FINLAY // LIBERÓ AL MUNDO / DE LA / FIEBRE AMARILLA
Slogan 13 — 3 December 1933 — Freddy Muguercia collection
ERP Slogan 14
1833 - 1933 FINLAY // GLORIA DE LA CIENCIA / SANEÓ EL TRÓPICO
Slogan 14 — 4 December 1933 — Robert Littrell collection
SÓLO SON HABANOS LEGITIMOS LOS TABACOS FABRICADOS EN CUBA - THE ONLY GENUINE HAVANA CIGARS ARE THOSE MADE IN CUBA
SÓLO SON HABANOS LEGITIMOS / LOS TABACOS FABRICADOS EN CUBA
THE ONLY GENUINE HAVANA / CIGARS ARE THOSE MADE IN CUBA
Slogan 15 — 13 September 1934 — Robert Littrell collection
SÓLO SON HABANOS LEGITIMOS LOS TABACOS FABRICADOS EN CUBA - THE ONLY GENUINE HAVANA CIGARS ARE THOSE MADE IN CUBA
SÓLO SON HABANOS LEGITIMOS / LOS TABACOS FABRICADOS EN CUBA
THE ONLY GENUINE HAVANA / CIGARS ARE THOSE MADE IN CUBA
Slogan 15A — 30 December 1935 — Robert Littrell collection
PROTEJA LA INDUSTRIA CUBANOS Y LOS PRODUCTOS CUBANOS FUME CIGARROS CUBANOS
PROTEJA LA INDUSTRIA CUBANOS / Y LOS PRODUCTOS CUBANOS / FUME CIGARROS CUBANOS
Slogan 18 — 16 October 1935 — Ernesto Cuesta collection
MARTÍ LIBERTO A CUBA Y GLORIFICO A AMERICA
MARTÍ LIBERTO A CUBA / Y GLORIFICO A AMERICA
Slogan 19 — 26 May 1939 — Ernesto Cuesta collection
Asista Serie Mundial / Base Ball Amateur
Asista Serie Mundial / Base Ball Amateur
Slogan 20 — 22 July 1939 — Robert Littrell collection
COOPERE CONSTRUCCIÓN OBELISCO EN GUÁIMARO
COOPERE CONSTRUCCIÓN / OBELISCO EN GUÁIMARO
Slogan 21 — 25 September 1939 — Robert Littrell collection
COOPERE CON EL CENSO 1953
COOPERE / CON EL / CENSO 1953
Slogan 23 — 15 January 1953 — Robert Littrell collection
COMPRE BONOS DE INDEPENDENCIA ECONOMICA
COMPRE BONOS DE / INDEPENDENCIA ECONOMICA
Slogan 24 — 13 August 1958 — Ernesto Cuesta collection