International Brigades, Valencia meter on cover to Amsterdam, Holland, rare destination

Censor mark used by the International Brigades Heller 4 and post mark SCC 111 Heller 9, dated on April 15, 1937. The Valencia meter is dated on April 16, 1937.

This cover should have been transited through the International Brigades exterior mail via Paris, with Rue Bleue postmark or meter, as it was addressed to Holland, which was considered a pro fascist country. The postal services via Paris started working on early April 1937 (see Ernst Heller, La historia y el servicio postal de las Brigadas Internacionales, pages 185-192).