Heimdallr Sharkey Mini Turtle DivervsSeiko Prospex Sea The Black Series

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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.

Heimdallr Sharkey Mini Turtle Diver at true scale

Sharkey Mini Turtle Diver

Seiko Prospex Sea The Black Series at true scale

Prospex Sea The Black Series

Diameter

45.5mm

45mm

Lug-to-Lug

47.7mm

47.7mm

Thickness

13.3mm

13.2mm

lowest

Water Resistance

200m

200m

Power Reserve

n/a

41h

MSRP

$149

lowest

$765

Movement

Hangzhou 2553A

Seiko 4R36

Case

2 specs
Diameter
45.5mm
45mm
Thickness
13.3mm
13.2mm

Crystal & Dial

2 specs
AR Coating
n/a
Anti-reflective coating on inner surface
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Hangzhou 2553A
Seiko 4R36
Power Reserve
0h
41h
Jewels
0
24

Pricing

1 specs
MSRP
$149
$765
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Reviews

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

Heimdallr Sharkey Mini Turtle Diver

Owners widely praise the Heimdallr SHARKEY Mini Turtle Dive Watch for its excellent finishing and surprising reliability, with many noting its good wearability and comfortable fit for its 45.5mm case size. The lume is generally considered strong, and the included rubber strap is well-regarded, with some owners opting to keep it. Accuracy figures vary, with one owner reporting +6 seconds per day and another seeing +-2 seconds per day, while one owner experienced losing a couple of minutes daily with poor lume. The bezel action is described as not as refined as higher-end watches, and one owner noted a slightly misaligned bezel. Overall, owners rate the Heimdallr SHARKEY Mini Turtle Dive Watch highly for its value, build quality, and satisfying Turtle-style aesthetic.

Seiko Prospex Sea The Black Series

The Seiko Prospex Sea The Black Series is praised for its distinct green sunburst dial and bezel, classic diver's dial layout, and excellent legibility with Seiko's strong lume. Owners note that the price is often discounted from the RRP, making it an excellent first proper watch. A reviewer notes a lost opportunity for a thinner appearance due to the bezel's design. On balance, owners and reviewers rate the Seiko Prospex Sea The Black Series highly for its legibility and distinctive dial at the price.

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