Corum is a La Chaux-de-Fonds manufacturer founded in 1955 by Gaston Ries and René Bannwart with an appetite for design innovation and a willingness to pursue eccentric concepts that few mainstream brands would attempt. The result is a catalog that includes some of the most memorable and collectible unconventional watches in Swiss history. The Corum Golden Bridge — first introduced in 1980 — positions its linear baguette movement vertically within a tonneau-shaped crystal case, so the movement is fully visible as the centerpiece of the design. The Coin Watch, housing a mechanical movement within a genuine United States twenty-dollar gold coin, is among the most singular collectible timepieces in the secondary market and a fixture of American watch auction catalogs. The Admiral's Cup, Corum's nautical-themed sports watch with its distinctive twelve-sided case, is the brand's most commercially important reference and the most widely traded pre-owned Corum. The Bubble, introduced in 2000 with its dramatically domed crystal, attracted a design-forward audience. Pre-owned Corum references offer genuine design distinction at prices that reflect the brand's position outside the first tier of prestige manufacturers. DeMesy & Co. in Dallas has been authenticating pre-owned Corum watches since 1987.