1. Blackburn Coll 2/4 Reference (shelfmark): Blackburn Coll 2/4 Title: The Blackburn Collection of Oviedo Censor Marks Scope & Content: Registered cover dated 1st November 1939, from Las Arriondas with a Heller (2000 Ed) A134.1 type censor mark. Collection Area: Philatelic Collections Languages: English and Spanish Date Range: 1 Nov 1939 Extent: 1 Page; 1 Item