Schnell claimed 93 victories, with 90 of them being scored in the Western front, including 12 four-engined bombers.  After being transferred to the Eastern front and shooting down 3 Soviet fighters, he himself was shot down and killed in February 1944.
This piece depicts Schnell's score at 57 kills, and shows the impressive art that adorned his aircraft.

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Luftwaffe Ace Sigfried Schnell's recreated Bf109 Rudder art, with kill markings

Schnell's original kill markings