Side by side
Borealis Watch Co. Caloura 300mvsSeiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
11 of 29 specs differDiameter
Caloura 300m42mm
Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch42.6mm
Power Reserve
Caloura 300m40h
Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch72h
Water Resistance
Caloura 300m300m
Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch300m
MSRP
Caloura 300m$275
Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch$3,600
Full specifications
Case
4 specsDiameter
42mm
42.6mm
Thickness
13.9mm
14.1mm
Lug-to-Lug
44.20mm
49.3mm
Lug Width
22mm
20mm
Crystal & Dial
3 specsCrystal Shape
Flat
Curved
AR Coating
Inner
Anti-reflective coating on inner surface
Lume
BGW9
LumiBrite on hands, index(es) and bezel
Movement
3 specsCaliber
NH35
8L45
Power Reserve
40h
72h
Jewels
25
35
Pricing
1 specsMSRP
$275
$3,600
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