Annual Calendar Flyback Chronograph

Reference 5905/1A-001

42 mm

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Specifications

Details

Brand: Patek Philippe
Model: Annual Calendar Flyback Chronograph
Reference: 5905/1A-001

Case

Material: Steel (thickness 14.13 mm)
Size: 42 mm
Dial: Sunburst olive green, white gold applied faceted baton markers
Crystal: Sapphire crystal case back (front crystal not detailed on source)

Movement

Type: Self-winding mechanical chronograph
Caliber: CH 28-520 QA 24H
Power reserve: 45-55 hours
Water resistance: 30 m
Production: Current on patek.com (Oct 2026); years not verified
Functions: Flyback chronograph with 60-minute counter, Annual calendar (day, date, month in apertures), Day/night indication