7 covers posted from "ΗΡΑΚΛΕΙΟΝ" between January 1937 and February 1938 bearing double-circle exchange control cachet "ΥΠΗΡΕΣΙΑ ΠΡΟΣΤΑΣΙΑΣ ΕΘΝΙΚΟΥ ΝΟΜΙΣΜΑΤΟΣ ΗΡΑΚΛΕΙΟΥ" (type 4b, Nr.37) in violet and biligual tapes "CONTROLE DU CHANGE" (Nr.10,12,15,16,17,34,94 and 138). Also censors mark "A.A." on 2 covers.