18k gold case 38x45mm. This watch was Andy Warhol’s Collection. Beta 21 quartz movement. The Beta 21 quartz movement is an electronic movement used in wristwatches. Developed in the late 1960s by the Swiss consortium CEH, it features a high-frequency quartz crystal oscillator (8192 Hz) for enhanced accuracy. While it had a limited production run, the Beta 21 movement played a crucial role in the advancement of quartz watch technology, marking the start of the industry’s quartz revolution.