Breguet Montre de poche 1907

Breguet's Montre de poche 1907, reference 1907BA/12, is a pocket watch in 18K rose gold measuring 57.9 mm in diameter. The case stands 22 mm thick and houses the manual-winding calibre 508 GS, with 56 hours of power reserve. A sapphire crystal covers the silvery, hand-guilloché dial, and a sapphire caseback lets the movement's finishing show through. Small seconds sit off-centre on the dial. The piece combines a minute repeater with a tourbillon, two of the most demanding complications in watchmaking, alongside a chiming clock function. Breguet hollow apple hands in steel mark the hours over the guilloché pattern. Given its construction, the case carries no water resistance rating and is described simply as not waterproof.