Cover with letterhead Socorro Rojo Internacional, Correspondencia del Combatiente from the front to Madrid, with postmark dated on June 26, 1937. Sent by the soldier Carlos Pascual, 28 Brigada, 2º Batallón, 4ª Compañía.
Registered cover from Las Navas del Marqués to Villaverde de Medina, with mark "Milicia Nacional / Batallón Cruces Negras de la Victoria Nº 1 / Ametralladoras", Villaverde censor mark Heller V95.1 and railway transit backstamp.
Air mail cover from the Madrid front to Gibraltar, with special field post postmark "FRENTE DE MADRID / CORREOS / 23 SET 1937 / ESTAFETA Nº 19" and Madrid censor mark Heller RM1.1.. Madrid air mail backstamp and mark "Via Marseille y Cerbére".
Stationery post card Edifil 75 uprated with 10c Edifil 682 to the prisoner José Luis Estrada Segalerva, falangist, lawyer and poet imprisoned in General Porlier street prison of Madrid, 3rd Gallery. Postmark "Sucurcsal Nº 9 Madrid" from May 3, 1937 and censor mark of the prison "SED BREVES EN LAS CONTESTACIONES".
International Brigades, cover to a brigadist, Perdo Puigdemont, "45 División, Plaza del Altozano Nº 12E - SRI Albacete". The code 12E was for the 12th Brigade General Staff. Pair of 30c with one bisected and Torredonjimeno postmark.
Post card franked with 25c Edifil 667 and Murcia postmark dated on Nov. 12, 1937, from the provincial prison to the same city. Sent by Emilio Díez de Revenga y Rodríguez, lawyer and son of Murcia's mayor Emilio Díez de Revenga Vicente. Sent to his wife María Josefa Torres Fontes.
Cover from Saint Etienne, France, to Bilbao, with was Nationalist zone, but missent to the Republican zone and there censored with Valencia mark Heller RV2.4 and returned to the sender with mark "Retour a / l'envoyeur". Very interesting example of disruption of the postal services due to the war.
Cover from Centuria Ferrer Guardia, Grupo Ametralladoras in La Escala (Girona) to Barcelona, with franchise mark on the front and the back "Centuria Ferrer-Guardia / FAI / CNT - AIT / La Escala". It contains a post card from Empuries archaeological site with the text. Extremely rare.
Air mail cover from Tarancon to Paris, with local Pro Komsomol J.S.U. Tarancon Allepuz 1. Postmark dated on July 8, 1937 and censor mark from Valencia Heller Rep. RV2.4. Arrival backstamp from Paris, Rue Singer, July 13, 1937. RRR.
Cover from Pozoblanco to Santander, with Town Council's mark and strike "Certifico: Que no hay sellos. El encargado" (I certify that there are not stamps. The clerk). Postmark from Pozoblanco dated on Feb 13, 1937. Unlisted Pozoblanco censor mark and three Socorro Rojo Internacional, Ayuda Hospitales, Provincial de Córdoba Allepuz 10 on tbe back, tied...
Condor Legion cover to Dresden sent through the German embassy via Berlin, where it was franked with a 12p German stamp to disguise its Spanish origin. Extremely rare piece. The sender, Kurt Boye, belonged to the 8th Battery of Flak Abteilung (8./F88, anti aircraft artillery).
International Brigades, air mail cover to Prague with censor Heller 5a and rare mute postmark formed by three concentrical circles. This is the first time we see such a postmark on an International Brigades cover. On the back, Paris transit of September 8, 1937 and Prague arrival marks dated on September 9, 1937.
International Brigades, post card to Switzerland only with mark SCC 111 dated on May 3, 1937 (Heller Birg. 9) used as franchise, as there are no stamps on the card. Rare circumstance and rare destination, as Swiss citizens fighting for foreign countries could loose their nationality.