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Seiko › Field › Seiko 5 Sports › SRPJ85

Seiko SRPJ85

Also covers SRPJ81: the same watch in other colors or straps.

Seiko 5 Sports · Field series. Sold new

Video reviews

The Best Automatic Field Watch For Smaller Wrists Under $300 - Seiko 5 Field Sport SRPJ81 Review
Teddy Baldassarre Reviews · YouTube
sbsa201 srpj85/srpj81k1 military / field watch review 2023
BLOKEPRIME · 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 · authorized

Seiko’s own warranty.

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.

Colors and versions (2)

Same case, movement and size; the versions differ in dial color, bezel or strap. Each reference number below is a separate model you can search for.

ReferenceComes onPriceStatusLook at it / buy
SRPJ85Nylon strap$315Sold newSee it at Seiko · eBay · Jomashop
SRPJ81—$315Sold newSee it at Seiko · eBay · Jomashop

The basics

Price
$315
Seiko US list, 2026-10-23
Size
36.4 mm × 12.5 mm
44.4 mm lug to lug
Strap width
18 mm
Any 18 mm strap fits
Comes on
Nylon strap
Water resistance
100 m
Sapphire crystal
No
Curved Hardlex
Lume
Hands and markers
Screw-down crown
Not listed by Seiko
Will it fit my wrist?

Rough rule of thumb from lug-to-lug length (44.4 mm), not a promise. Wrist shape matters; try one on if you can.

How it works day to day

Movement
Automatic, hand-winding
Caliber 4R36
Bezel
No rotating bezel listed
Hacking seconds
Yes
Seconds hand stops when you pull the crown, so you can set the time exactly
Hand-winding
Yes
Power reserve
About 41 hours

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Sources