Air Mail cover 1937-39 envelopes recovered from wrecks, comprising 1937 Cygnus (2, both with cachet in violet), 1938 Calpurnia (2, one with cachet in red and one accompanied by Advice to Recipient slip) and 1939 Centurian (2, both with red cachet, one a part strike only), and 1954 envelope from Hong Kong to Scotland with cachets in English and French; the usual damage in places