Which is cheaper, the Seestern Sub 300 V4 or the Seiko Prospex Sea?

At MSRP the Seestern Sub 300 V4 is the cheaper of the two at $10, against $900 for the Seiko Prospex Sea — a $890 gap before any retailer discounting.

Which is bigger, the Seestern Sub 300 V4 or the Seiko Prospex Sea?

The Seestern Sub 300 V4 wears larger at 42mm versus 41mm for the Seiko Prospex Sea — a 1mm difference across the dial.

Which has a longer power reserve, the Seestern Sub 300 V4 or the Seiko Prospex Sea?

The Seiko Prospex Sea carries a 70-hour power reserve against 41 hours on the Seestern Sub 300 V4.

What movement does the Seestern Sub 300 V4 run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Seestern Sub 300 V4 uses the Seiko NH35A and the Seiko Prospex Sea uses the 6R35.

Side by side

Seestern Sub 300 V4vsSeiko Prospex Sea

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

Seestern Sub 300 V4

Sub 300 V4

MSRP $10

Seiko Prospex Sea

spb317j1

MSRP $900

At a glance

15 of 29 specs differ

Diameter

Sub 300 V442mm

Prospex Sea41mm

Power Reserve

Sub 300 V441h

Prospex Sea70h

Water Resistance

Sub 300 V4200m

Prospex Sea200m

MSRP

Sub 300 V4$10

Prospex Sea$900

Full specifications

Case

6 specs

Diameter

42mm

41mm

Thickness

13mm

12.3mm

Lug-to-Lug

46mm

46.9mm

Material

316L Stainless Steel

Stainless Steel

Finish

Brushed + Sandblasted

Brushed and polished

Caseback

Solid screw-down

Solid

Crystal & Dial

4 specs

Crystal Shape

Flat

Curved

AR Coating

Underside

Anti-reflective coating on inner surface

Dial Color

Orange

Black

Lume

Japan Lume (blue glow)

LumiBrite on hands, index(es) and bezel

Movement

4 specs

Caliber

Seiko NH35A

6R35

Beat Rate

21,600 vph

28,800 vph

Power Reserve

41h

70h

Complications

GMT, Date

None

Pricing

1 specs

MSRP

$10

$900

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Seestern Sub 300 V4

Owners widely praise the Seestern Sub 300 V4 for its terrific fit and finish and surprising little touches at its $179 price, noting top-notch case, dial, bezel, and crystal. The bracelet is considered nice enough for the price point, and the watch is powered by the solid and reliable Seiko NH35 movement. Some owners report that the polished sides of the case show signs of wear. Overall, owners rate the Seestern Sub 300 V4 highly for its excellent case, dial, and bezel finishing at the price.

WatchUSeek·3

Seiko Prospex Sea

Owners widely praise the Seiko Prospex Sea for its excellent lume, robust build, and value, with many highlighting the comfortable 4 o'clock crown and reliable movements. Reviewers note impressive case finishing and attractive dials, with specific models lauded for their gradient blue designs and smooth bezel actions. Accuracy figures vary, with one owner reporting +9 seconds/day after demagnetization, while others find the watches to be good first "proper" watches. Some owners find the stock rubber straps uncomfortable or the overall size substantial on smaller wrists. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its combination of strong dive watch functionality and appealing design at its price point.

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