Seiko SBTR027 39.8mm quartz chronograph

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The Seiko SBTR027 is a 39.8mm quartz chronograph from the Seiko Selection line, featuring a gray sunburst dial, tachymeter bezel, and 100m water resistance. It is powered by the Caliber 8T63 “MechaQuartz” movement, offering 1/5-second timing, a 60-minute register, 24-hour hand, date display, and $pm$15 sec/month accuracy.

Core Specifications:

Case Diameter: 39.8 mm
Thickness: 11.6 mm – 11.7 mm
Lug-to-Lug: 47.0 mm
Case Material: Stainless Steel
Crystal: Hardlex
Movement: Seiko Cal. 8T63 Quartz (Battery: SR936SW)
Water Resistance: 10 Bar / 100 Meters
Band Width: 20 mm
Weight: 122 g

Features:

Dial: Gray sunburst dial with black tachymeter bezel
Chronograph: 1/5-second, 60-minute totalizer
Lume: Lumibrite on hands and indexes
Functions: Hours, minutes, small seconds, 24-hour indicator, date, chronograph, tachymeter
Clasp: One-push three-fold clasp

The SBTR027 is known as a high-value “MechaQuartz” offering, where the chronograph second hand ticks at 4Hz (sweeps) when activated, unlike the 1Hz tick of the running small-second hand.

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