Breitling Premier B15 Duograph 42 Stainless Steel Ref# AB1510171C1P1, box and papers

Breitling Premier B15 Duograph Blue Dial 42 mm Stainless Steel case. Fixed bezel. Cambered sapphire, glareproofed both sides crystal. Breitling B15 calibre, Mechanical hand-wound, 70 hours power reserve, 27 jewels. Alligator Leather strap Folding clasp. Water resistance 100 m (330 ft)

TECHNICAL DATA

• Caliber: Breitling B15 (Manufacture)
• Movement: Mechanical hand-wound
• Power reserve: approx. 70 hrs
• Chronograph: 1/4th second, 30 minutes
• Vibration: 28,800 v.p.h
• Jewel: 27 jewels
• Case material: Stainless Steel
• Caseback: Screwed in (sapphire crystal)
• Water resistance: 100 m (330 ft)
• Bezel: Fixed
• Crown: Non screw-locked, two gaskets, integrated pushpiece
• Crystal: Cambered sapphire, glareproofed both sides
• Product Weight (Approx.): 120.0 g.
• Watch-head Weight (Approx.): 97.9 g.
• Diameter: 42.0 mm
• Thickness: 15.3 mm
• Height (upper lug tip to lower lug tip): 50.0 mm
• Lug width (in-between lug): 22.0 mm
• Strap material: Alligator Leather
• Strap color: Gold Brown
• Strap type: Curved
• Lug: 22/18 mm
• Buckle Material: Stainless Steel
• Buckle type: Folding clasp
• Buckle size: 18 mm

“Duograph” was a term used by Breitling in the 1940s and refers to a “chronograph rattrapante". A rattrapante (from the French “rattraper” – to catch up) is one of the most elaborate of all watch complications. In terms of manufacturing difficulty, it’s on a par with the tourbillon and minute repeater. Its function is to measure two elapsed times at once (intermediate and split time), which it shows via two hands on the central chronograph. The Duograph is powered by the manually wound cosc-certified Breitling Manufacture Caliber B15, featuring two patented innovations: one to simplify the mechanism and the other to improve accuracy.

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