At the time of his death Baron Manfred Albrecht Von Richthofen had a collection of eighty silver cups. What did they stand for?

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http://www.martinfrost.ws/htmlfiles/april2007/red_baron.html "Manfred von Richthofen's red Fokker Dr.I triplane, serial 425/17 After his first victory, Richthofen ordered a silver cup engraved with the date of the fight and the type of enemy machine from a jeweller friend in Berlin. He continued this tradition until he had 60 cups, by which time the supply of silver in blockaded Germany was restricted." Dec 08 11, 6:28 AM