Helicon Siebe Gorman Type D Professional DivervsSeiko Prospex Sea 1968 Heritage Diver's GMT

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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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Buy from Helicon Used on eBay
Prospex Sea 1968 Heritage Diver's GMT
SeikoProspex Sea 1968 Heritage Diver's GMT

MSRP $1,500

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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 1968 Heritage Diver's GMT at true scale

Prospex Sea 1968 Heritage Diver's GMT

Diameter

41mm

42mm

Lug-to-Lug

47.5mm

lowest

48.6mm

Thickness

11.9mm

lowest

12.9mm

Water Resistance

300m

highest

200m

Power Reserve

42h

72h

highest

MSRP

$746

lowest

$1,500

Movement

Miyota 9039

Seiko 6R54

Case

4 specs
Diameter
41mm
42mm
Thickness
11.9mm
12.9mm
Lug-to-Lug
47.5mm
48.6mm
Water Resistance
300m
200m

Crystal & Dial

3 specs
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 6R54
Power Reserve
42h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$746
$1,500
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