Which is cheaper, the Oblvlo FM SL Day-Date Square or the Seiko Prospex Sea Save the Ocean Special Edition?

At MSRP the Oblvlo FM SL Day-Date Square is the cheaper of the two at $158, against $625 for the Seiko Prospex Sea Save the Ocean Special Edition — a $467 gap before any retailer discounting.

Which is bigger, the Oblvlo FM SL Day-Date Square or the Seiko Prospex Sea Save the Ocean Special Edition?

The Seiko Prospex Sea Save the Ocean Special Edition wears larger at 45mm versus 39mm for the Oblvlo FM SL Day-Date Square — a 6mm difference across the dial.

Which has better water resistance, the Oblvlo FM SL Day-Date Square or the Seiko Prospex Sea Save the Ocean Special Edition?

The Seiko Prospex Sea Save the Ocean Special Edition is rated to 200m versus 50m for the Oblvlo FM SL Day-Date Square.

Which has a longer power reserve, the Oblvlo FM SL Day-Date Square or the Seiko Prospex Sea Save the Ocean Special Edition?

The Oblvlo FM SL Day-Date Square carries a 42-hour power reserve against 41 hours on the Seiko Prospex Sea Save the Ocean Special Edition.

What movement does the Oblvlo FM SL Day-Date Square run compared to the Seiko Prospex Sea Save the Ocean Special Edition?

Both watches run automatic movements — the Oblvlo FM SL Day-Date Square uses the Miyota 8215 and the Seiko Prospex Sea Save the Ocean Special Edition uses the 4R36.

Side by side

Oblvlo FM SL Day-Date SquarevsSeiko Prospex Sea Save the Ocean Special Edition

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

Oblvlo FM SL Day-Date Square

FM-SL-DD-D

MSRP $158

Seiko Prospex Sea Save the Ocean Special Edition

srpf77

MSRP $625

At a glance

12 of 29 specs differ

Diameter

FM SL Day-Date Square39mm

Prospex Sea Save the Ocean Special Edition45mm

Power Reserve

FM SL Day-Date Square42h

Prospex Sea Save the Ocean Special Edition41h

Water Resistance

FM SL Day-Date Square50m

Prospex Sea Save the Ocean Special Edition200m

MSRP

FM SL Day-Date Square$158

Prospex Sea Save the Ocean Special Edition$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

4R36

Power Reserve

42h

41h

Jewels

Pricing

1 specs

MSRP

$158

$625

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