Lot 539
1 1/2 s. on 20 c. blue and registered stamp 1 s. on 20 c. grey and additional franking Ecuador 10 c. green tied by blue dated cachet "SERVICO DE TRANSPORTES AEREOS ECUADOR-COLUMBIA GUAYQUIL SCADTA 28.AGO.1929" to registered cover to Bogota with arrival mark, some minor staining, otherwise fine, scarce
