Cover franked with 1932 1b 80c bright ultramarine AIR issue on 'Winchester Security Paper' (SG 436) tied by LAGUNILLAS (ZULIA) cds. Addressed to USA with two partial strikes of boxed 'EL ZANCUDO TRASMITE EL PALUDISMO EXTERMINELO Secunde al Gobierno Nacional en esta patriotica campana' illustrated Mosquito Eradication cachet in purple on front & reverse with MARACAIBO transit cds also on front. Uncommon.