Switzerland, 1937 (Apr. 12) Switzerland to Brazil Zeppelin Cover, registered cover bearing vertical pair of Switzerland, 40c on 90c Air Post with vermilion Surcharge (C25a) as well as single of normal surcharge and Nos. C10a and C12a, all tied by two neat strikes of "Bern Mattenhof 12.IV.37" cds to Rio De Janeiro, Brazil, appropriate flight cachet, neat Frankfurt-Basel (4.13) transit and Rio de Janeiro (4.17) arrival backstamps, Very Fine; with 1978 Friedl certificate and signed by Bloch. Estimate  $5,000 - 7,500. SCARCE AND DESIRABLE WITH THE PAIR WITH THE VERMILION SURCHARGE (THESE CATALOGUE $800.00 APIECE AS USED IN SCOTT). $0 (Image)