Helicon Siebe Gorman Type D Professional DivervsSeiko Prospex Sea

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Siebe Gorman Type D Professional Diver
HeliconSiebe Gorman Type D Professional Diver

Ref. siebe-gorman-type-d-professional-diver-abyss-blue-limited-edition-vip-pre-order·MSRP $746

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Prospex Sea
SeikoProspex Sea

MSRP $900

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Buy from Seiko Used on eBay

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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.

Helicon Siebe Gorman Type D Professional Diver at true scale

Siebe Gorman Type D Professional Diver

Seiko Prospex Sea at true scale

Prospex Sea

Diameter

41mm

41mm

Lug-to-Lug

47.5mm

46.9mm

lowest

Thickness

11.9mm

lowest

12.3mm

Water Resistance

300m

highest

200m

Power Reserve

42h

70h

highest

MSRP

$746

lowest

$900

Movement

Miyota 9039

Seiko 6R35

Case

3 specs
Thickness
11.9mm
12.3mm
Lug-to-Lug
47.5mm
46.9mm
Water Resistance
300m
200m

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
n/a
n/a
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Miyota 9039
Seiko 6R35
Power Reserve
42h
70h
Jewels
0
24

Pricing

1 specs
MSRP
$746
$900
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