Technical Specifications:

• 
  Manufacturer: ETA


• 
  Caliber Number: 2688


• 
  Base Caliber: ETA 2681


• 
  Movement Type: Automatic, self-winding mechanical

Dimensions:

• 
  Lignes: 8.75’’’


• 
  Diameter: 19.4 mm


• 
  Height: 5.35 mm

Performance:

• 
  Jewels: 17 (minimizes friction in key areas)


• 
  Beat Rate: 21,600 vibrations per hour (vph) / 3 Hz


• 
  Lift Angle: 51°


• 
  Power Reserve: 38 hours


• 
  Rotor Style: Ball-bearing for efficient winding

Functions:

• 
  Central hours, minutes, and seconds hands


• 
  Day and date display at 3:00


• 
  Hacking Seconds: Yes (allows precise time-setting as the seconds hand stops when the crown is pulled out)

Features:

• 
  Hand-Windable: Yes, can be manually wound


• 
  Anti-Shock Device: Incabloc system for enhanced durability


• 
  Regulator: Etachron with a micro-adjuster for fine-tuning accuracy

Hand Sizes:

• 
  Hour: 1.20 mm


• 
  Minute: 0.70 mm


• 
  Seconds: 0.20 mm

Country of Manufacture:

• 
  Switzerland (Swiss Made), ensuring high-quality craftsmanship and precision engineering