Cover franked with 1932 5c brown, 1b 20c blue green and 1b 80c bright ultramarine 'Banknote' paper AIR issue on front tied by undated LAGUNILLAS 'Arms' cancel with handstruck 'SEP 29 1937' date alongside plus 1937 15c grey black on reverse tied by MARACAIBO cds (SG 426, 434, 436 & 472). Sent airmail to USA with fair strike of boxed 'EL ZANCUDO TRASMITE EL PALUDISMO EXTERMINELO Secunde al Gobierno Nacional en esta patriotica campana' illustrated Mosquito Eradication cachet in black on reverse. Uncommon.