Alsta NautoscaphvsBremont Supermarine 300M

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Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Alsta Nautoscaph at true scale

Nautoscaph

Bremont Supermarine 300M at true scale

Supermarine 300M

Diameter

40mm

40mm

Lug-to-Lug

51.3mm

n/a

Thickness

16.2mm

12mm

lowest

Water Resistance

300m

300m

Power Reserve

41h

n/a

MSRP

$695

lowest

$3,550

Movement

Seiko NH35

Bremont BE-92AE

Case

4 specs
Thickness
16.2mm
12mm
Lug-to-Lug
51.3mm
n/a
Lug Width
n/a
20mm
Material
Bronze
904L Stainless Steel

Crystal & Dial

1 specs
Dial Color
n/a
Green

Movement

2 specs
Caliber
Seiko NH35
Bremont BE-92AE
Power Reserve
41h
0h

Pricing

1 specs
MSRP
$695
$3,550
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Reviews

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

Alsta Nautoscaph

Owners widely praise the Alsta Nautoscaph for its vintage-inspired design, cinematic appearances in films like "Jaws" and "Fear and Loathing in Las Vegas," and its "70s cool" aesthetic. Reviewers note its contrasting case finishes and functional, lumed dial, though the absence of a lumed numeral at 3 o'clock due to the date window is a minor drawback. One reviewer flags the watch's 15.1mm thickness and poor bracelet execution as significant issues, deeming it a "colossal failure" at its price point, while another owner suggests it is egregiously overpriced at MSRP but a fun summer piece in the $500-600 range. On balance, owners and reviewers are divided on the Alsta Nautoscaph's value and wearability, with its aesthetic appeal and cinematic provenance being its strongest selling points.

Bremont Supermarine 300M

The Bremont Supermarine 300M is praised for its comfortable 40mm case, which some owners find wears well even on smaller wrists due to its lug design, outperforming some 40mm watches. One forum contributor notes the 40mm case is relatively compact for a 300m diver and is priced at $1375. A reviewer found the 40mm case comfortable. On balance, owners and reviewers appreciate the Bremont Supermarine 300M's wearable 40mm case size and comfortable wearability.

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