Essentials Automatic

Ref. SRPH87

Case diameter: 41.2 mm; Manufacturer spec
Lug-to-lug: 48.5 mm; Manufacturer spec
Thickness: 11.8 mm; Manufacturer spec
Lug width: 20 mm; Manufacturer spec

Retail price $315 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 48.5 mm

How the Essentials Automatic wears

Its lugs add 7.3 mm to the 41.2 mm case, close to the 7 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 6.75" to 8" (17.1–20.3 cm); below 6.75" the lugs start to reach the edge of the wrist.

At 11.8 mm thick it is thicker than 63% of the 142 other everyday watches we've measured, so expect it to sit tall on the wrist.

Its 20 mm lug width is one of the most common strap sizes; 186 other watches here share it, so aftermarket straps are easy to find.

Will the Essentials Automatic fit your wrist?

With a 48.5 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.

Wrist	Flat width (est.)	Fit
6"	47.2 mm	Lugs overhang
6.5"	51.2 mm	Snug, lugs near the edge
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Ideal fit

Specifications

Reference: SRPH87
Collection: Essentials
Status: In production
Case material: stainless steel
Crystal: Hardlex
Water resistance: 100 m
Bezel: fixed
Dial: blue
Strap / bracelet: stainless steel bracelet, tri-fold push-button clasp
Style: Everyday

Movement

Caliber: Seiko 4R35
Type: automatic
Power reserve: 41 hours
Jewels: 23

7 other watches use the Seiko 4R35

Takes 20 mm straps. See other 20 mm watches and straps.

More Essentials references

SeikoEssentials QuartzSUR525
Case
40.2 mm
Lug-to-lug
47 mm
Thick
8.3 mm

Watches that wear the same size

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

Same 20 mm lug width

All 20 mm watches

These take the same straps as the Essentials Automatic.

Sources

seikousa.com/products/srph87