The Beta 21 caliber was a strange bird, although it made sense given the engineering constraints of the time. The basic timing package was a https://www.replicabreitlingwatch.io/product-category/breitling-premier/ replica breitling premier watches quartz crystal with a frequency of 8192 Hz, and the hands were driven by a tuning fork motor https://www.orologireplicarolex.co/collezione/rolex-oyster-perpetual/ replica rolex oyster perpetual orologi similar to the system used in the original Accutron. The system worked well enough but it https://www.replicabreitlingpro.io/product-category/breitling-colt/ replica breitling colt watches was very power-hungry and the Beta 21 soon gave way to more efficient movements.