1918-1920 US Pilot Wings Sterling Blackington Design. This is a museum quality  reproduction in sterling silver of the a US Pilot wing use right after WWI where they no longer used the "US" letters on the wing, until the more current design came into being in 1921. The use of the US was dropped due to international convention on wings. This one of the few wings ever made in the WWI basic design but without the US letters.