Seiko 7A28-7049 Quartz Chronograph (“Sports 100”) — Fully Serviced, Period-Correct Bracelet

A fully serviced Seiko 7A28-7049 quartz chronograph — the sport / tool-watch variant of the 7A28 platform, featuring a black dial, 100m sport case, and rotating tachymeter bezel. This example has been mechanically and electrically verified, fitted with a new crystal and fresh gaskets, and regulated to exceptional accuracy at the bench. Turn-key and ready to wear.

Video Overview

Bench documentation and overview of this Seiko quartz chronograph.

If the video does not appear, view it directly here: https://youtu.be/bKwW6YiXu_Q

Highlights

• Model: Seiko 7A28-7049 quartz chronograph (“Sports 100”)
• Movement: Seiko 7A28 high-grade analog quartz chronograph caliber
• Case: 100m sport case with rotating tachymeter bezel
• Dial: Original black dial with three sub-registers
• Crystal: New crystal installed (original crystal also included)
• Gaskets: All new (crown, pushers, caseback)
• Accuracy: Bench-verified at -0.02 seconds per day
• Functions: Chronograph start, stop, and reset all working
• Power: Fresh battery installed

Condition & Authenticity Notes

• Case presents with clean lines and honest wear consistent with age.
• Original case, dial, and hands retained; no artificial refinishing.
• Bracelet: The bracelet is the correct reference for the 7A28-7049 but is not original to this specific watch — a period-correct match, not a born-with example. Some link pins were replaced during fitment. Disclosed for full transparency.
• All functions operate as designed.

Second Tour Timeworks — restored to be worn, verified to be trusted.