Dornier Merkur

The Dornier Merkur's first flight was in February 1925. It was a successor to the Dornier C Komet, which first flew in 1922. The Merkur had additional space for up to eight passengers and various technical improvements.
Walter Mittelholzer and CH-171 made a record flight for time, flying the distance of 20.000 km from Zurich to Cape Town in december 1925.
Swissair took over Ad Astra's two Dornier Merkurs after its founding, but got rid of them in the same year.

Source: sr692