Split-Seconds (Rattrapante) Chronographs

Movement & mechanism

• A second chronograph hand mounted on its own wheel, controlled by a separate split-seconds pusher
• A clamp (pincer) mechanism that grips the split hand's wheel, allowing it to stop while the main chronograph continues
• Additional column wheel or lever system dedicated to the split function

Identification

• Two overlapping seconds hands sharing the same pivot point
• A third pusher, usually in the crown or case band, dedicated to the split function

Terminology

• Rattrapante — French for 'catching up', describing the split hand rejoining the main hand
• Pincer (clamp) — the component briefly gripping the split-seconds wheel

Known variations

• Two-hand rattrapante
• Triple split (multiple superimposed complications) — a modern extension of the classic split-seconds concept

Pocket-watch ancestry

Split-seconds mechanisms were developed for pocket chronographs and pocket-timing instruments used in sport, science and railway timing before being adapted, with considerable difficulty given their added thickness, to wrist calibres.

Collecting notes

Among the most technically complex and expensive chronograph variants to collect, valued for both complexity and rarity relative to standard chronographs.