Seiko › Divers › Prospex › SJE101
Seiko SJE101
Prospex · Marinemaster. Sold new
Video reviews
Degenerate Watch Addict · YouTube
The Calibrated Wrist · YouTube
Videos are made by independent reviewers and play from YouTube; they’re not ours. We picked ones that name this reference. Own one? Share your photos.
Where to buy
New · grey market (unauthorized)
Often cheaper. Covered by the store’s own warranty, not Seiko’s.
Pre-owned
Check condition, box and papers. Usually no warranty.
Search links show live listings, so check the exact reference before you buy. Prices change; each one shows when we checked it. We may earn a commission from some links. It doesn’t change your price or which stores we list. Authorized vs grey market vs pre-owned.
The basics
Price
$2,800
Seiko US list, 2026-10-23
Size
39.5 mm × 12.3 mm
47.2 mm lug to lug
Strap width
20 mm
Any 20 mm strap fits
Water resistance
200 m
Sapphire crystal
Yes
Lume
Hands, markers and bezel
Screw-down crown
Yes
Will it fit my wrist?
Rough rule of thumb from lug-to-lug length (47.2 mm), not a promise. Wrist shape matters; try one on if you can.
How it works day to day
Movement
Automatic, hand-winding
Caliber 6L37, rated +15 to -10 seconds per day
Bezel
Unidirectional rotating
Hacking seconds
Yes
Seconds hand stops when you pull the crown, so you can set the time exactly
Hand-winding
Yes
Power reserve
About 45 hours