The Gruen 712CA watch movement, which is equivalent to the Longines 503, is a design originally created by Record and later adopted by Longines after acquiring Record. It is unclear whether the subsequent versions with 21600A/h were also offered as Record calibres. This movement is automatic and includes functions such as sweep second, day, and date, which can be set by changing the time between 19:30-24h. It was introduced in 1955 and has been in use since then.