Circa 1980 cover franked on reverse with strip of three 1980 3p bright emerald (SG 1755) tied by circular 'O.N.D.A. S.A AGENCIA No. 53 MELO' cancel in purple of the Organización Nacional de Autobuses. Addressed to MONTEVIDEO with printed black on green 'ONDA S.A. MELO A Montevideo 2o R. CONTRADO Se adhiere al sobre' EXPRESS label also on reverse.