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4 Variants
Lume:BGW9
Retail MSRP
$275
Low
—
Avg
—
High
—
Static data
Case
42mm
Power Reserve
—
Movement
Automatic
Water Resistance
300m
01
Case Dimensions
Diameter42mm
Thickness—
Lug-to-Lug—
Lug Width—
02
Case Build
MaterialStainless Steel
Water Resistance300m
03
Crystal & Dial
CrystalSapphire
LumeBGW9
04
Movement
Caliber
TypeAutomatic
Beat Rate—
Power Reserve—
Jewels—
HackingNo
Hand-WindingNo
ComplicationsTime only
05
Design Language
Dial styleMatte
BezelRotating (dive)
Bracelet / strapLug-attached bracelet
HandsBaton
AI-detected from product image · 5/22/2026
In a nutshell
The Borealis Watch Co. Caloura 300m (ref. borealis-caloura-diver-watch) is an automatic diver watch, with a 42mm stainless steel case, 13.9mm thick, powered by the NH35 movement. Water resistance is rated to 300m, under a sapphire crystal. Manufacturer MSRP is $275.