Cal. SF215 is a hand-winding 2-pusher chronograph movement with optional full calendar produced by Stoltz Frères (Angelus) in the 1930s and 1940s. It was introduced late in the decade, replacing the company’s earlier Cal. SF15 and Cal. SF210, to which it is closely related. The Angelus Chronodato, introduced in 1942, used the related Cal. SF217.
Some examples include a full calendar module, which is included in the specifications here.