A <a href="https://en.wikipedia.org/wiki/en:SPA_6A" class="extiw" title="w:en:SPA 6A">SPA 6A</a> 6-cylinder inline engine from WWI on display at the <a href="https://en.wikipedia.org/wiki/en:Gianni_Caproni_Museum_of_Aeronautics" class="extiw" title="w:en:Gianni Caproni Museum of Aeronautics">Gianni Caproni Museum of Aeronautics</a>.
<a href="//commons.wikimedia.org/wiki/User:MLWatts" title="User:MLWatts">MLWatts</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>