2025 Seiko Prospex 'Alpinist' Green 39mm Automatic SPB121J1

When it comes to modern Seikos and references, there really aren't many that come close to the Alpinist in terms of fame. Seiko introduced the Alpinist in 1961 under its Laurel sub-brand, which is Seiko's oldest sub-brand, first introduced in 1913. It was inspired by the Japanese term Yama-Otoko, meaning "Mountain Man." These men required equipment that was robust and accurate, as they led many expeditions. Seiko reintroduced the Alpinist in 1995 after a 30-year gap. Here we have the classic 2025 Seiko Prospex 'Alpinist' Green Automatic SPB121J1. Featuring a satin-brushed 39mm stainless steel case with tapering lugs and polished and brushed flanks, leads to a lug-to-lug length of 46mm and a thickness of 12.5mm, ensuring a comfortable fit on your wrist. On the right side, we have a screw-down crown with crown guards, and at 4 o’clock, a second crown is used to adjust the rotating inner compass bezel. A stepped, smooth-brushed bezel holds a flat, scratch-resistant sapphire crystal, AR-coated on the inside. An outer rotating compass chapter ring encircles the striking sunburst green dial. An outer rotating 360-degree compass minute surrounds a minute track that is precisely executed with LumiBrite pips. Attractive applied gilt Arabic numerals with alternating dagger indexes mark the hours. At 3 o’clock, there is a date window with Cyclops magnification on the sapphire crystal. Elegant LumiBrite-filled gilt cathedral-style hands are complemented by an arrow-point centre-seconds hand. Giving the watch a vintage look and feel. At noon, we have the gold-cloured Seiko, and at 6 o’clock, the Prospex motif Automatic 20Bar completes this striking classic adventurer's timepiece. On the reverse, there is a screw-down exhibition case back, inside an automatic Seiko 6R35, 24 jewels, 21,600 beats per hour. It is paired with its Seiko 20mm strap and a folding clasp. It also comes with a Seiko presentation box, swing tag and papers.

This watch is sold with its original Seiko box, swing tag and paperwork. It is paired with its Seiko 20mm strap and a folding clasp. The watch is from July 2025 and is sold in lightly worn condition, as you can see. It comes with our 12-Months Warranty.

An icon among the Seiko collection and one that most collectors have owned or know very well, the Seiko Alpinist. This is the new reference SPB121J1 with the iconic green dial and cathedral hands, but also with a sapphire crystal and the workhorse automatic Seiko calibre 6R35. If you haven't owned a Seiko Alpinist yet, this is the one to snap up and add to your collection so you can tick the box!

Reference : SPB121J1 (6R35-00E0)
Movement : Automatic Seiko Cal. 6R35
Age : July 2025
Year : 2025
Case Size : 39mm
Case Thickness : 12.5mm
Lug to Lug : 46mm
Lugs : 20mm
Condition : Pre-Owned
Box and Papers : Box & Papers
Case Material : Stainless Steel
Warranty : 12-Months Warranty
The wrist model's wrist size is 7inch

Seiko's history began in 1881 when Kintaro Hattori established the K. Hattori retail and repair store. In 1892, Seikosha was established to make wall clocks. 1895 saw the production of their first pocket watch. 1913 saw the launch of their first wristwatch, the Laurel. In 1924, the first Seiko was manufactured. Daini Seikosha (now Seiko Instruments Inc.) was established in 1937. Seiko was listed on the Tokyo stock exchange in 1949. The Suwa factory became independent and formed Suwa Seikosha Co., Ltd. (now Seiko Epson Corporation in 1959). In 1956, Seiko launched Marvel as their first true in-house-made watch; they continued to make this watch until 1959. The Seiko Lord Marvel, introduced in 1958, was Seiko's first luxury watch, predating the well-known Grand Seiko. It was designed to rival Swiss brands with a refined design and higher specifications. In 1967, Seiko launched the calibre 5740C watch movement, a significant upgrade over the earlier calibre 5740A, which beat at 18,000, and the 5740B, which beat at 19800. This movement was special because it allowed the watch to run at a high speed of 36,000 beats per hour, making it Japan's first high-frequency watch. In fact, it was only the second watch movement of its kind in the world, following one released by a Swiss brand just a few months earlier. Japan’s first chronograph watch was introduced for the 1964 Tokyo Olympics; it was called the Seiko Crown Chronograph monopusher. Not stopping there, Seiko launched Japan's first true divers' watch, the Seiko Diver’s 150M, fitted with the automatic Calibre 6217, which was later given the nickname “62MAS” by collectors. King Seiko and Grand Seiko emerged as prominent lines within the Seiko brand, with King Seiko making its debut in 1961 as a distinguished luxury watch collection. Grand Seiko, on the other hand, has consistently set the standard for exceptional craftsmanship and precision engineering. In 1965, Seiko introduced a groundbreaking manual-wind movement featuring 25 jewels and hacking seconds, coinciding with the launch of the second-generation KSK series, which boasted sharp, angular cases and robust, flat-ended lugs. The King Seiko KCM was introduced in 1969, featuring a chronometer-certified movement that operates at an impressive 36,000 beats per hour, along with a sleek C-shaped stainless steel case. In 1975, the King and Grand Quartz brands were introduced, built at the Suwa Seikosha and Daini Seikosha factories. In 1977, a high-end Twin Quartz Cal. 92 was produced until 1979, when the 97KQ and 99KQ were introduced. The final 1981 King Quartz Cal. 94KQ movement remained in production until Seiko ended the King Seiko line in 1985. Despite the challenges during the Quartz crisis of the 1970s that led to the gradual shutdown of King Seiko production, Seiko made a comeback in 2022 by reintroducing the classic King Seiko collection. The company name was changed to the Seiko Corporation in 1990. Innovation at Seiko continues today with GPS Solar watches.