1928 - 1934, extensive collection, extensive collection with approximate 280 covers and postal stationery, mostly with the 5 C. airmail stamp franked, as well much legitimate postage, first flights with useful, many destinations, interesting and better cancellations, forwardings, a few documents with additional frankings with by special delivery stamps, mixed frankings with others countries (including Mexico multiple) and further special feature, with also few airmail documents from abroad, together in 5 albums