Swatch Sistem Fudge SUTC401

The 42 mm plastic case is 13.8 mm thick, with stick-and-dot markers and stick hands on the brown dial. The automatic movement is held by a single central screw, runs for 90 hours on a full wind and is visible through the caseback, where the rotor circles the edge of the works. Swatch fixes the movement into the case with structural adhesive, so it cannot be serviced.

The Sistem Arlequin (SUTW402) is the same plastic watch with a silver sunburst dial instead of brown, and the Sistem Chic (SUTB402) swaps the markers for Arabic numerals on matte white. The steel Sistem51 Irony models, such as the Sistem Earth (YIS400), carry the same movement in a stainless steel case.