The Oris caliber 421 is a modern automatic mechanical movement developed by Oris as part of their expanding in-house caliber series. It builds on the technical strengths of previous Oris movements while introducing advanced features that appeal to enthusiasts seeking precision, durability, and contemporary watchmaking innovations.

Key Features of Oris Caliber 421

• Type: Automatic (self-winding)

• Functions:

  • Hours, minutes, central seconds

  • Date display

  • Power reserve indicator

  • GMT (second time zone) complication, allowing tracking of a second time zone via an additional hand

• Jewels: Approximately 28

• Frequency: 28,800 vibrations per hour (4 Hz)

• Power Reserve: Approximately 120 hours (5 days)

• Winding: Bi-directional automatic winding mechanism

• Additional Features:

  • High resistance to magnetic fields, utilizing non-ferrous materials

  • Robust construction designed for long service intervals and enhanced durability

  • Visible power reserve and GMT indications, often integrated cleanly into the dial design

  • Advanced finishing, including Geneva stripes, perlage, and branded rotor

Technical Significance

The Oris 421 movement represents the brand’s push towards producing highly functional, in-house calibers that combine traditional mechanical excellence with modern technological advancements. The inclusion of a GMT function and power reserve indicator in one movement offers practical versatility for travelers and everyday users alike.

Its extended power reserve of 120 hours significantly exceeds many standard automatic movements, providing convenience for those who may not wear their watch daily.

Applications

• Found in select Oris collections that target the luxury sports and travel watch markets.

• Ideal for wearers who value mechanical complexity combined with robust performance and longer power reserves.

• The GMT complication makes it especially useful for professionals and enthusiasts who frequently cross time zones.

Conclusion

The Oris caliber 421 is a modern, sophisticated automatic movement featuring a GMT complication and power reserve indicator. It exemplifies Oris’s dedication to blending heritage craftsmanship with contemporary innovations, offering wearers a reliable, versatile, and technically advanced mechanical caliber. Its combination of features and durability makes it a standout choice within Oris’s growing family of in-house movements.