See this auction site:
https://www.flyingtigerantiques.com/extremely-rare-wwi-greek-pilot-badge-in-gilt-silvered-brass.html
World War I Greek Pilot Badge in Gilt & Silvered Brass.
VINTAGE: Circa World War I.
SIZE: Approximately 2-3/8" x 1-1/4".
MATERIALS / CONSTRUCTION: Gilt brass.
ATTACHMENT: Vertical kick type pin with a tongue / tube type C type catch.
MARKINGS: N/A
ITEM NOTES: This is from a foreign militaria collection which we will be listing more of over the next few months. CON-RLB-19 LEEGEX08/22/19 SEJJJX10/19
CONDITION: 8 (Excellent-): The badge shows minor to moderate wear, much of the gilt details remain intact, overall handsome patina.