Calculator watch financial functions (in the Casio CBA-10). Usually calculator watch operates with eight digits number, however, calculator watch can operate with 6 digits (for example, Casio C-801) or 10 digits (Casio CBA-10) numbers. Calculator watches first appeared in the mid 1970s introduced by Pulsar (1975, then a brand of the Hamilton Watch Company) and Hewlett Packard. Several watch manufacturers have made calculator watches over the years, such as Pulsar and Timex, but the Japanese electronics company Casio produced the largest variety of models. In the mid-1980s, Casio created the Databank calculator watch, which not only performed calculator functions, but also stored
Yamaha electric guitar models position). The controls were a five position pickup selector and master volume and master tone controls. The bridge was a TRS-Pro locking tremolo. All hardware was gold plated. Finish options were Antique Sunburst, Black Burst, Faded Blue and Violet Burst. YAMAHA began making the RGX 121 S in 2003 The RGX 420 S was introduced in 2003. The Yamaha RGX 420 is an electric guitar that, so far, has been released two times in versions "S" and "dz", featuring different paint-finishes but all the same mechanics and electronics. YAMAHA manufactured the RGX 420 SD6 (Drop 6) between 2001 and 2003