Seiko Prospex SRQ055J1 – Speedtimer Mechanical Chronograph

A refined expression of Seiko’s motorsport timing heritage, the Seiko Prospex SRQ055J1 is a mechanical chronograph designed for precision performance and everyday wear. Powered by the in‑house Caliber 8R48 automatic movement — complete with column wheel and vertical clutch for smooth chronograph action — this watch delivers up to 45 hours of power reserve and crisp timing functions. Its bold black dial with contrasting subdials, tachymeter scale on the bezel, and LumiBrite hands provide excellent visibility and a classic sports look. Encased in durable stainless steel with super‑hard coating and protected by a dual‑curved sapphire crystal, the SRQ055J1 blends horological craftsmanship with practical functionality.

Specifications
Model: SRQ055 / SRQ055J1
Collection: Seiko Prospex Speedtimer
Movement: Automatic with manual winding — Seiko Caliber 8R48 (approx. 45‑hour power reserve)
Accuracy: +25 to −15 seconds per day
Jewels: 34
Chronograph:
- Central chronograph seconds
- 30‑minute counter ]
- 12‑hour counter
Date Display: Between 4 and 5 o’clock
Case Material: Stainless steel with super‑hard coating
Case Diameter: 42.0 mm
Case Thickness: 14.6 mm
Lug‑to‑Lug: 49.5 mm
Crystal: Dual‑curved sapphire with anti‑reflective coating on the inner surface
Dial: Black with tachymeter scale and subdials
Bracelet: Multi‑link stainless steel with three‑fold clasp and push button release
Water Resistance: 10 bar / 100 m
LumiBrite: Applied on hands and markers for low‑light visibility
Bezel: Fixed tachymeter scale
Caseback: Screw‑down Weight: ~191 g