The Certina DS Action Diver Chronograph is a diver's watch (per ISO 6425 standards) powered by a self-winding movement with chronograph and date. The case measures a generous 45.7mm across; as pictured, the dial is black.
Automatic chronograph movement with date window. Introduced in 2008-2009 as the result Tissot asking ETA to develop a Swiss made chronograph movement suitable for large-scale production at low cost, though collectors soon recognized the famed Lemania 5100 in the lay-out. The latter was mostly seen in military- and tool-watches and discontinued in the early 2000's. The new C01.211 is mostly (or only?) found in the lower segment brands of the Swatch Group.