Watch Almanac
Seiko

5 Sports Field Sports Style 36mm

Ref. SRPJ85

Case diameter
36.4 mm
Manufacturer spec
Lug-to-lug
44.4 mm
Manufacturer spec
Thickness
12.5 mm
Manufacturer spec
Lug width
18 mm
Manufacturer spec

Retail price $315 (US, Oct 2026)

Ideal fit
Wrist flat: 55.1 mmLug-to-lug: 44.4 mm

How the 5 Sports Field Sports Style 36mm wears

Its lugs add 8 mm to the 36.4 mm case, close to the 7.1 mm typical across the almanac, so its diameter is a fair guide to how it wears.

On our fit model it sits best on wrists from 6.25" to 7.5" (15.9–19.1 cm); below 6.25" the lugs start to reach the edge of the wrist.

At 12.5 mm thick it is thicker than 69% of the 26 other field watches we've measured, so expect it to sit tall on the wrist.

Its 18 mm lug width is one of the most common strap sizes; 12 other watches here share it, so aftermarket straps are easy to find.

Will the 5 Sports Field Sports Style 36mm fit your wrist?

With a 44.4 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.

WristFlat width (est.)Fit
6"47.2 mmSnug, lugs near the edge
6.5"51.2 mmIdeal fit
7"55.1 mmIdeal fit
7.5"59.1 mmIdeal fit
8"63 mmWears small

Specifications

Reference
SRPJ85
Collection
5 Sports
Status
In production
Case material
stainless steel
Crystal
curved Hardlex
Water resistance
100 m
Bezel
fixed steel
Dial
black
Strap / bracelet
nylon strap
Weight
64 g
Style
Field, Everyday

Movement

Caliber
Seiko 4R36
Type
automatic
Power reserve
41 hours
Frequency
21,600 vph (3 Hz)
Jewels
24
Accuracy
+45/-35 s/day

4 other watches use the Seiko 4R36

Takes 18 mm straps. See other 18 mm watches and straps.

More 5 Sports references

Watches that wear the same size

Other watches within 1.5 mm of its lug-to-lug.

Same 18 mm lug width

All 18 mm watches

These take the same straps as the 5 Sports Field Sports Style 36mm.

Sources