Side by side
Borealis Watch Co. JamantavsSeiko Prospex Sea The Black Series
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
11 of 29 specs differDiameter
Jamanta42.50mm
Prospex Sea The Black Series45mm
Power Reserve
Jamanta40h
Prospex Sea The Black Series41h
Water Resistance
Jamanta300m
Prospex Sea The Black Series200m
MSRP
Jamanta$415
Prospex Sea The Black Series$765
Full specifications
Case
5 specsDiameter
42.50mm
45mm
Thickness
13.30mm
13.2mm
Lug-to-Lug
50.40mm
47.7mm
Lug Width
22mm
22mm
Water Resistance
300m
200m
Crystal & Dial
2 specsAR Coating
Inner
Anti-reflective coating on inner surface
Lume
BGW9
LumiBrite on hands, index(es) and bezel
Movement
3 specsCaliber
Miyota 9015
4R36
Power Reserve
40h
41h
Jewels
25
24
Pricing
1 specsMSRP
$415
$765
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