422Ref

The Tetra Neomatik introduces a larger 33x33mm case and the automatic DUW 3001 movement while retaining its signature square shape, stepped lugs, and typography. Reference 422 features a 'tiefblau' dial, while the 421 offers a silver version; the series was later rebranded as Tetra Neomatik Nachtblau, though it is unclear if the dial color was adjusted.