2025 Seiko Prospex Alpinist ‘Night Sky’ Limited SPB531J1

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 to be robust and accurate as they led many expeditions. Seiko reintroduced the Alpinist in 1995 after a 30-year gap. The SPB531J1 is based on their classic SPB121, incorporating many of the features of the previous generations and was only available in Europe. A 2025 Seiko Prospex Alpinist ‘Night Sky’ SPB531J1 Limited to 3000 pieces. Featuring a satin-brushed 39.5mm stainless steel case with tapering lugs and polished and brushed flanks, leads to a lug-to-lug length of 46.5mm and a thickness of 13mm, 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 vertical brushed ‘Night Sky’ blue dial, inspired by the night skies over the mountains near where they are produced. An outer minute track is precisely executed with LumiBrite pips. Attractive applied polished 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 cathedral-style hands are complemented by a fine centre-seconds hand with a lume tip. Giving the watch a vintage look and feel. 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 two Seiko 20mm straps in the box. It also comes with a Seiko special edition presentation box, swing tag and papers.

This watch is sold with its original Seiko special edition box, swing tag and paperwork. It is paired with two Seiko 20mm straps in the box. The watch is from September 2025 and is sold in lightly worn condition, as you can see. It comes with our 12-Months Warranty.

Another fantastic take on the Seiko Alpinist, this 2025 Seiko Alpinist ‘Night Sky’, reference SPB531J1, is limited to 3000 pieces total. The Alpinist DNA is unmistakable, and the blue tone works perfectly in this format, especially with the subtle pop of gold. Paired with the blue strap, it adds an almost dressy feel to this tactile field watch, showing just how versatile it is. Add this to your collection today and save yourself a nice chunk on RRP!

Reference : SPB531J1 (6R35-03H0)
Movement : Automatic Seiko Cal. 6R35
Age : September 2025
Year : 2025
Case Size : 39.5mm
Case Thickness : 13mm
Lug to Lug : 46.5mm
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

Seikos 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. 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. The company name was changed to the Seiko Corporation in 1990. Innovation at Seiko continues today with GPS Solar watches.