The ETA 6498-1 is a mechanical watch movement that was originally designed by Record and later adopted by Longines. It is not clear if there were other variations available as Wittnauer calibres. The movement includes functions such as manual winding, sweep second, and a date feature that can be set by changing the time from 19:30 to 24h. The C11KS was commonly used during the approximate period of 1960, however, specific differences between the 11KS and C11KS-2 are unknown.