Celebrating my own "Certina-DS week" with the last of the breed (I think). When I bought a DS-3 Automatic with the in-house 919-1 caliber I thought that it was the last in line, until this came up: DS-4 Automatic. Same caliber, more slender case. Mostly you will find Quartz movements in a DS-4, but there are two alternatives. The first one today, and the second tomorrow, from then on it's "old school" DS.