A Lemania chronograph from the 1940s centered on the Cal.2310 represents a moment when fine chronograph engineering was being refined. The movement is described as a column‑wheel design with a screwed balance running at 18,000 A/h and a distinctive “wishbone” shaped bridge, details that speak to careful construction and classical finishing. Cal.2310’s development alongside Omega (where it became known as Cal.321) placed it at the heart of mid‑century chronograph practice. Today such watches interest collectors who appreciate historically significant movement design and mechanical character rather than modern complications.