Watch Almanac
Seiko

Prospex Land Mechanical 38mm

Ref. SPB249

Case diameter
38 mm
Manufacturer spec
Lug-to-lug
46.2 mm
Manufacturer spec
Thickness
12.9 mm
Manufacturer spec
Lug width
19 mm
Manufacturer spec

Retail price $750 (US, Oct 2026)

Ideal fit
Wrist flat: 55.1 mmLug-to-lug: 46.2 mm

How the Prospex Land Mechanical 38mm wears

Its lugs add 8.2 mm to the 38 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 6.5" to 7.75" (16.5–19.7 cm); below 6.5" the lugs start to reach the edge of the wrist.

At 12.9 mm thick it is thicker than 85% of the 26 other field watches we've measured, so expect it to sit tall on the wrist.

Its 19 mm lug width is one of the most common strap sizes; 21 other watches here share it, so aftermarket straps are easy to find.

Will the Prospex Land Mechanical 38mm fit your wrist?

With a 46.2 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
SPB249
Collection
Prospex
Status
In production
Case material
stainless steel
Crystal
curved sapphire
Water resistance
200 m
Bezel
fixed steel
Dial
blue
Strap / bracelet
stainless steel bracelet, three-fold clasp
Weight
146 g
Style
Field, Everyday

Movement

Caliber
Seiko 6R35
Type
automatic
Power reserve
70 hours
Frequency
21,600 vph (3 Hz)
Jewels
24
Accuracy
+25/-15 s/day

6 other watches use the Seiko 6R35

Takes 19 mm straps. See other 19 mm watches and straps.

More Prospex references

Watches that wear the same size

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

Same 19 mm lug width

All 19 mm watches

These take the same straps as the Prospex Land Mechanical 38mm.

Sources