Gronefeld Watches - Billing themselves as the Horological Brothers, Bart and Tim Gronefeld come from a family of watchmakers dating back more than a century to 1912. Today, the watchmaking Gronefeld brothers work together to create sophisticated horological works of art. Their watches, which have won Grand Prix de Horlogerie de Geneve awards, include the Parallax Tourbillon, Decennium Tourbillon, the 1941 Remontoire, and more.