Which is cheaper, the Borealis Watch Co. Jamanta or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

At MSRP the Borealis Watch Co. Jamanta is the cheaper of the two at $415, against $2,800 for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch — a $2,385 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Jamanta or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

The Borealis Watch Co. Jamanta wears larger at 42.50mm versus 39.5mm for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch — a 3mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Jamanta or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

The Borealis Watch Co. Jamanta is rated to 300m versus 200m for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch.

Which has a longer power reserve, the Borealis Watch Co. Jamanta or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

The Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch carries a 45-hour power reserve against 40 hours on the Borealis Watch Co. Jamanta.

What movement does the Borealis Watch Co. Jamanta run compared to the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

Both watches run automatic movements — the Borealis Watch Co. Jamanta uses the Miyota 9015 and the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch uses the 6L37.

Side by side

Borealis Watch Co. JamantavsSeiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Borealis Watch Co.Jamanta

prometheus-jamanta-black-dial-date-miyota-9015

MSRP $415

Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch

sje117j1

MSRP $2,800

At a glance

12 of 29 specs differ

Diameter

Jamanta42.50mm

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch39.5mm

Power Reserve

Jamanta40h

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch45h

Water Resistance

Jamanta300m

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch200m

MSRP

Jamanta$415

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch$2,800

Full specifications

Case

5 specs

Diameter

42.50mm

39.5mm

Thickness

13.30mm

12.3mm

Lug-to-Lug

50.40mm

47.2mm

Lug Width

22mm

20mm

Water Resistance

300m

200m

Crystal & Dial

3 specs

Crystal Shape

Flat

Box

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

BGW9

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Miyota 9015

6L37

Power Reserve

40h

45h

Jewels

Pricing

1 specs

MSRP

$415

$2,800

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