Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin — Boss Hunting

But it’s under the proverbial hood where this 2026 release truly shines: a near six-decade continuation of an ultra-thin movement architecture that ranks among the defining achievements of 20th-century automatic watchmaking.

Sitting at just 4.05mm thick, Vacheron Constantin’s Calibre 1120 QP/1 is so absurdly thin that the title “Ultra-Thin” almost doesn’t do it justice. Especially when you consider what’s packed inside: an automatic winding system and a full perpetual calendar…