Internal registered cover with 'Jose Sing & Co. Colorado, Guanacaste' handstamp at top franked on reverse with 3 x 1942 15c on 20c blue (SG 326) tied by COLORADO cds's in blue dated 25 ABR 1943 with fine boxed 'COLORADO CANTON DE ABANGARES' registration marking on front. Addressed to SAN JOSE with MANZANILLO transit cds on front and SAN JOSE arrival cds on reverse. Cover is also censored on arrival in SAN JOSE with printed 'DEFENSA CONTINENTAL No.27' censor strip at right.