In the early 1920s, Vienna was a hub for experimental aviation and luxury craft. A tie bar of this quality was not a mass-produced souvenir; it was likely a bespoke commission made from an actual mahogany aircraft propellor. This was a common practice for items gifted to early pilots or patrons of the Austrian Aero-Club. The pull-out clasp is a safety feature typical of expensive antique pins intended to be worn on silk ties without slipping. Horse head hallmark with W is the assay mark for Vienna 1922-1925.
Your tie bar is a rare Vienna-assayed (1922-1925) presentation piece.
MATERIALS: 14k gold (marked), mahogany
AGE: c. 1925
CONDITION: Very good - Austrian horse head hallmark with W for Vienna (two to indicate that two elements of the pin were tested for gold content), 585 gold mark, H&F maker's mark
SIZE: 2" x 5/8"