The Metatechnical Cabinet
Sprachwahl

Movement Manufacturers: O
- OC
- Omega (Omega S.A., Biel-Bienne, Switzerland)
- Orient (Orient Watch Co Ltd., Tokyo, Japan)
- Oris (Oris, Höstein, Basel-Landschaft, Switzerland)
- Osco (OSCO Uhrenfabrik Schlund GmbH, Villingen-Schwenningen, Germany)
- Otero (Uhrenrohwerke Otto Epple, Königsbach, Germany)