Which is cheaper, the Boldr Marine or the Sinn U18?

At MSRP the Boldr Marine is the cheaper of the two at $439, against $3,488 for the Sinn U18 — a $3,049 gap before any retailer discounting.

Which is bigger, the Boldr Marine or the Sinn U18?

The Sinn U18 wears larger at 44mm versus 40mm for the Boldr Marine — a 4mm difference across the dial.

Which has better water resistance, the Boldr Marine or the Sinn U18?

The Sinn U18 is rated to 2000m versus 200m for the Boldr Marine.

Which has a longer power reserve, the Boldr Marine or the Sinn U18?

The Sinn U18 carries a 42-hour power reserve against 40 hours on the Boldr Marine.

What movement does the Boldr Marine run compared to the Sinn U18?

Both watches run automatic movements — the Boldr Marine uses the NH35A and the Sinn U18 uses the SW300-1.

Side by side

Boldr MarinevsSinn U18

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

Add a watch

Boldr Marine

marine-elewana

MSRP $439

Sinn U18

U18

MSRP $3,488

At a glance

17 of 29 specs differ

Diameter

Marine40mm

U1844mm

Power Reserve

Marine40h

U1842h

Water Resistance

Marine200m

U182,000m

MSRP

Marine$439

U18$3,488

Full specifications

Case

9 specs

Crystal & Dial

5 specs

Crystal Shape

Flat

—

AR Coating

Yes

—

Dial Color

Defender Elewana

Black

Indices

Applied

—

Lume

Super-LumiNova

None

Movement

2 specs

Caliber

NH35A

SW300-1

Power Reserve

40h

42h

Pricing

1 specs

MSRP

$439

$3,488

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Borealis Watch Co.micro

Follow this matchup

Get a note when Boldr Marine vs Sinn U18 gets more votes, a community discussion, or a price drop. No account needed.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.

Borealis Watch Co. Caloura 300mvsSinn U18 Borealis Watch Co. NeptunovsSinn U18 Baltic Aquascaphe ClassicvsSinn U18 CWC RN81 Clearance Diver Automatic WatchvsSinn U18 Marathon OSAR-D (Original SAR with Date) Automatic 46mmvsBoldr Marine Marathon JDD (Jumbo Day/Date) Anthracite Diver's AutomaticvsBoldr Marine

Edit this comparison Add another watch Explore more 39–45mm watches

Boldr MarinevsSinn U18

At a glance

Full specifications

More watches worth a look

Caloura 300m

OSAR-D (Original SAR with Date) Automatic 46mm

Neptuno

JDD (Jumbo Day/Date) Anthracite Diver's Automatic

Aquascaphe Classic

S502

RN81 Clearance Diver Automatic Watch

Marinemaster M-44 DLC

Follow this matchup

People also compared