Which is cheaper, the Oblvlo JM Rotor or the Seiko Prospex Sea?

At MSRP the Oblvlo JM Rotor is the cheaper of the two at $299, against $625 for the Seiko Prospex Sea — a $326 gap before any retailer discounting.

Which is bigger, the Oblvlo JM Rotor or the Seiko Prospex Sea?

The Seiko Prospex Sea wears larger at 43.8mm versus 42mm for the Oblvlo JM Rotor — a 1.8mm difference across the dial.

Which has better water resistance, the Oblvlo JM Rotor or the Seiko Prospex Sea?

The Seiko Prospex Sea is rated to 200m versus 50m for the Oblvlo JM Rotor.

Which has a longer power reserve, the Oblvlo JM Rotor or the Seiko Prospex Sea?

The Oblvlo JM Rotor carries a 42-hour power reserve against 41 hours on the Seiko Prospex Sea.

What movement does the Oblvlo JM Rotor run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Oblvlo JM Rotor uses the Miyota 8215 and the Seiko Prospex Sea uses the 4R35.

Side by side

Oblvlo JM RotorvsSeiko Prospex Sea

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

Oblvlo JM Rotor

JM-ROTOR

MSRP $299

Seiko Prospex Sea

srpe37

MSRP $625

At a glance

12 of 29 specs differ

Diameter

JM Rotor42mm

Prospex Sea43.8mm

Power Reserve

JM Rotor42h

Prospex Sea41h

Water Resistance

JM Rotor50m

Prospex Sea200m

MSRP

JM Rotor$299

Prospex Sea$625

Full specifications

Case

6 specs

Crystal & Dial

2 specs

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Miyota 8215

4R35

Power Reserve

42h

41h

Jewels

Pricing

1 specs

MSRP

$299

$625

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Oblvlo JM RotorvsSeiko Prospex Sea

At a glance

Full specifications

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