Seiko 7C46
High confidenceThe quartz Tuna caliber. Built to drive heavy hands under load and to be opened and serviced, which is unusual for a quartz movement and is the reason the quartz professional divers have remained in the line for four decades.
Specifications
- Movement manufacturer
- Seiko
- Production
- 1986–present
- Jewels
- 7
- Winding
- quartz
- Complications
- Date
Architecture
High-torque professional quartz caliber with a date, designed for a multi-year battery life and for servicing rather than disposal.
References using this caliber
- Seiko SBBN015Factory
Prospex · 2010–2016
Provenance of this record
Sources & Evidence
Primary sourceTechnical documentation
Seiko caliber technical guides and parts catalogues
Seiko Watch Corporation / Seiko Instruments
- Accessed
- 2026-08-18
Cited for
This referenceHigh confidence
Last verified: Not yet reviewed