Seiko - Prospex - Men - 2020-2025
07
days
07
hours
20
minutes
32
seconds
Starting bid
€ 1
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Selected by Masayuki Nakai
Over 16 years buying and selling 1990s and 2000s watches with expert knowledge.
Estimate € 750 - € 900
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The Seiko Prospex Alpinist SPB121J1 (JDM SBDC091) is an automatic stainless-steel watch from 2020–2025 with a green dial, a 40 mm case and a leather strap, in good condition with visible signs of wear.
AI-assisted summary
Description from the seller
A0000006776
Article: SEIKO Prospex Alpinist automatic wristwatch, green sunburst dial (which under artificial light looks almost black) with gold applied numerals and indices, gold cathedral hands, internal compass bezel operated by the crown at 4 o'clock and magnified date at 3 o'clock.
Reference / Edition: SPB121J1 (JDM SBDC091), case 6R35-00E0, Alpinist line relaunched in 2020.
Diameter: 39.5 mm.
Bracelet: black calfskin leather strap signed "SEIKO CALF" with beige stitching, 20 mm lug, steel buckle engraved "SEIKO", strap length 190 mm.
Movement: automatic, Seiko caliber 6R35 with 24 jewels (70 hours power reserve, hackable seconds and manual winding), visible through the transparent case back.
Period: 2020 onwards.
Materials: stainless steel case and buckle, sapphire crystal with anti-reflective coating, transparent case back, green sunburst dial with gold numerals, indices and compass scale, luminescent indices and hands, leather strap.
Condition: good overall condition, with light signs of use on the case and lugs and the strap showing wear on the leather and on the pins; crystal, dial and indices without appreciable damage; serviced and adjusted in our workshop, functioning correctly.
Accessories: only the loose piece (watch and strap); original box, documents and warranty are not visible in the photos.
Watchmaking workshop review:
· 02/11/2026, workshop report: On arrival the watch was functioning correctly. After inspection, the quality control shows a deviation of 8 s/d, an amplitude of 251°, and a beat error of 0.1 ms. Condition on arrival: 7/10. Condition on departure: 8/10.
The photographs form part of the description.
A0000006776
Article: SEIKO Prospex Alpinist automatic wristwatch, green sunburst dial (which under artificial light looks almost black) with gold applied numerals and indices, gold cathedral hands, internal compass bezel operated by the crown at 4 o'clock and magnified date at 3 o'clock.
Reference / Edition: SPB121J1 (JDM SBDC091), case 6R35-00E0, Alpinist line relaunched in 2020.
Diameter: 39.5 mm.
Bracelet: black calfskin leather strap signed "SEIKO CALF" with beige stitching, 20 mm lug, steel buckle engraved "SEIKO", strap length 190 mm.
Movement: automatic, Seiko caliber 6R35 with 24 jewels (70 hours power reserve, hackable seconds and manual winding), visible through the transparent case back.
Period: 2020 onwards.
Materials: stainless steel case and buckle, sapphire crystal with anti-reflective coating, transparent case back, green sunburst dial with gold numerals, indices and compass scale, luminescent indices and hands, leather strap.
Condition: good overall condition, with light signs of use on the case and lugs and the strap showing wear on the leather and on the pins; crystal, dial and indices without appreciable damage; serviced and adjusted in our workshop, functioning correctly.
Accessories: only the loose piece (watch and strap); original box, documents and warranty are not visible in the photos.
Watchmaking workshop review:
· 02/11/2026, workshop report: On arrival the watch was functioning correctly. After inspection, the quality control shows a deviation of 8 s/d, an amplitude of 251°, and a beat error of 0.1 ms. Condition on arrival: 7/10. Condition on departure: 8/10.
The photographs form part of the description.
Details
Brand
Seiko
Gender
Men
Model
Prospex
Band material
Leather
Shipped insured
Yes
Band length
Regular (180–200 mm)
Period
2020-2025
Repainted dial
No
Movement
Automatic
Dial colour
Green
Case material
Stainless steel
Original box included
No
Original papers included
No
Case diameter
40 mm
Original warranty included
No
Condition
Good - visible signs of wear
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