The Girard-Perregaux Girard PerregauxTri-Compax 1940s Tri-Compax Moonphase in 14K Yellow Gold, introduced in 1940, is a Yellow gold-cased luxury mechanical wristwatch. The case measures 35 mm. The dial is White. It wears on a Leather strap/bracelet. On the secondary market, the Girard PerregauxTri-Compax 1940s Tri-Compax Moonphase in 14K Yellow Gold averages $8,350 across 1 active listing. When buying pre-owned, check condition grade, box and papers (typically a 10–20% premium), service history, and originality of dial and hands. Use the listings and price history on this page to benchmark fair market value.