Breguet Classique Répétition Minutes 7637

Breguet's Classique Répétition Minutes 7637, reference 7637EB/10/9ZU, has a 42 mm case in white gold. The case measures 12.3 mm thick, with lugs set 22 mm apart. A sapphire crystal covers the white dial, and a sapphire caseback allows a view of the manually wound calibre 567.2 inside, which runs at 2.5 Hz and holds a 40 hour power reserve. The watch carries a minute repeater, activated by a lever between 8 and 10 o'clock, striking the hours, quarters and minutes on a spring blade rather than a bell gong. Small seconds appear on the dial as well. The case closes on an alligator leather strap fitted with a white gold folding clasp. Water resistance is not part of this watch's specification; Breguet lists it as not waterproof.