Prospex Alpinist GMT Watch SPB377J1

The Watch

The iconic Seiko brand enjoys an international reputation built on its unique expertise and creative, innovative vision. Founded in 1881 in Japan, it continues to impress with robust, high-performance, and reliable timepieces - from the most classic to the most sporting - designed to suit every taste. Combining timeless elegance, innovative technology, and a bold sporting design, this SPB377J1 watch is ready to become your go-to everyday companion. Part of the Prospex Alpinist collection, it will beautifully adorn a men's wrist, bringing the perfect modern and refined touch to any outfit. From outdoor excursions to extreme adventures, it's comfortable and a pleasure to wear in any situation. Designed for men, it features a round case in brushed stainless steel that sits elegantly on the wrist with perfectly proportioned dimensions. The case measures 39.45 mm in diameter and 13.55 mm in thickness, and features a scratch-resistant coating for exceptional durability. A domed anti-reflective sapphire crystal covers the dial to protect it from shocks and everyday scratches, while offering superior legibility from any angle. It is surrounded by a fixed bezel graduating in black with baton indices for odd hours and Arabic numeral indices for even hours. Fixed, it supports a fourth hand sweeping across the dial to display the GMT second time zone function. Two knurled, screw-down crowns at 3 and 4 o'clock allow you to manually set and wind the hands, date window, and inner ring. A transparent window set into the screw-down caseback lets you admire the movement in action. The caseback guarantees 200-meter water resistance.

The Dial

This watch features a round dial in dark blue that enhances your wrist with a smooth, sharp analog display. Its semi-glossy finish offers impressive yet practical complications for daily life. Two semi-skeleton hands in grey - including one with a "Mercedes" design - sweep across the dial alongside a slender grey seconds hand to indicate hours, minutes, and seconds. Coated with Lumibrite, all three hands point to twelve grey indices for quick, clear time reading even in the dark. The indices appear as Arabic numerals at 3, 6, 9, and 12 o'clock and as trapezoids for the remaining hours. A finely graduated minute track featuring white marks runs along the perimeter, complemented by round Lumibrite indices every five minutes. A fourth grey hand with a Lumibrite arrow tip in red joins the display to show the time in a second time zone. The dial also features a bidirectional inner bezel marked with cardinal and intercardinal points serving as a compass. Between 4 and 5 o'clock, a round date window with a black background displays the date via white Arabic numerals. The brand signs its watch beneath 12 o'clock with its name and "X" logo, while noting the movement type, water resistance, and power reserve at 6 o'clock.

The Movement

At the heart of this timepiece beats the Seiko 6R54 caliber, bringing the watch to life with fluid, precise movement. With a 72-hour power reserve, this automatic movement of Japanese manufacture delivers accurate and reliable timekeeping on every occasion. Renowned for its high quality and dependable performance, it features 24 jewels and operates at a frequency of 21,600 beats per hour (3 Hz).

The Strap

The case holds on both sides a stitched bovine leather strap that gives the watch an elegant, refined touch. Dressed in blue, it wraps your wrist softly and precisely, ensuring comfortable wear in any condition. A sophisticated modern addition, it elevates any outfit day or night. Its single folding clasp features push buttons for a secure yet effortless fit. The lug width measures 20 mm.

Water Resistance

With 200-meter water resistance - 20 ATM in watchmaker's terms - this watch is built for recreational diving. It can handle showers, baths, and shallow-water swimming or snorkeling (apnea). For professional scuba diving, our Ocarat watch specialists have selected dedicated 30 ATM models, available through an additional search on our site. One final reminder: never operate the pushers or crown while in the water.