Australia, stamp 1915 Mi.17; SG.44, Map with kangaroo £1 ultramarine / brown, cat. Gibbons £1300

(via Philasearch.com: 36 Burda Auction – item 9251-A36-1131)

(Source: http://www.philasearch.com/en/i_9251_1131/Australia/michel_51.html?breadcrumbId=144985723)

Australia 1931 – Scadta cover with additional Columbian gold dollar plus franking, flown Buenaventura to Cali. 

(Source: http://www.philasearch.com/en/i_9300_4535/Australia/7-A2035-4535.html?breadcrumbId=118008006)

1932 – Australia / Steamship Bremen-Southampton 25.05.: Cover with Australian and American stamps, both cancelled Brisbane, Queensland, forwarded via USA (day cancel Ferry Station) to Hamburg (arrival and airmail cancellation). One of the three known covers. (HA 80 AUS) (via Philasearch.com: Christ-Stamps Zeppelin and Aviation specialized auction – item 7-A2035-4699)

(Source: http://www.philasearch.com/en/i_9300_4699/Australia/7-A2035-4699.html?breadcrumbId=118002411)