Borealis Watch Co. JamantavsSeiko Prospex Sea

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Jamanta
Borealis Watch Co.Jamanta

MSRP $415

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Prospex Sea
SeikoProspex Sea

MSRP $625

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Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Borealis Watch Co. Jamanta at true scale

Jamanta

Seiko Prospex Sea at true scale

Prospex Sea

Diameter

42.5mm

43.8mm

Lug-to-Lug

50.4mm

48.7mm

lowest

Thickness

13.3mm

12.8mm

lowest

Water Resistance

300m

highest

200m

Power Reserve

n/a

41h

MSRP

$415

lowest

$625

Movement

Miyota 9015

Seiko 4R35

Case

4 specs
Diameter
42.5mm
43.8mm
Thickness
13.3mm
12.8mm
Lug-to-Lug
50.4mm
48.7mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
AR Coating
n/a
Anti-reflective coating on inner surface
Lume
BGW9
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Miyota 9015
Seiko 4R35
Power Reserve
0h
41h
Jewels
0
23

Pricing

1 specs
MSRP
$415
$625
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