De Havilland DH.34 in flight over unidentified countryside.
Unknown author<span style="display: none;">Unknown author</span>
1922-1924 (probably around 1922, when DH.34 was introduced)
<p>E-Pics Bildarchiv online <a rel="nofollow" class="external free" href="https://doi.org/10.3932/ethz-a-000093209">http://doi.org/10.3932/ethz-a-000093209</a><br></p>
ETH-Bibliothek Zürich, Bildarchiv / Fotograf: Unbekannt / Ans_05338-02-118-AL-FL / Public Domain Mark