https://www.garagejournal.com/forum/showthread.php?t=337182&page=70
More here: Quite a remarkable Sinclair collection!
http://1914-1918.invisionzone.com/forums/topic/173218-ww1-military-motors-1916-set-x-50-cards/?do=findComment&comment=2415480
View post: what Snoopy was referring to, for all those years, a real Sopwith Camel
http://1914-1918.invisionzone.com/forums/topic/173218-ww1-military-motors-1916-set-x-50-cards/?do=findComment&comment=2416120
See original here: an unusual but poignant use of a propeller