Elliot Brown Holton Automatic: 101-A10vsSeiko Prospex Sea 1968 Heritage Diver's GMT Limited Edition

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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.

Elliot Brown Holton Automatic: 101-A10 at true scale

Holton Automatic: 101-A10

Seiko Prospex Sea 1968 Heritage Diver's GMT Limited Edition at true scale

Prospex Sea 1968 Heritage Diver's GMT Limited Edition

Diameter

43mm

42mm

Lug-to-Lug

n/a

48.6mm

Thickness

14mm

13.3mm

lowest

Water Resistance

200m

300m

highest

Power Reserve

40h

72h

highest

MSRP

$792

lowest

$1,750

Movement

Seiko NH35

Seiko 6R54

Case

5 specs
Diameter
43mm
42mm
Thickness
14mm
13.3mm
Lug-to-Lug
n/a
48.6mm
Lug Width
n/a
20mm
Water Resistance
200m
300m

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
Seiko NH35
Seiko 6R54
Power Reserve
40h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$792
$1,750
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Reviews

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

Elliot Brown Holton Automatic: 101-A10

The Elliot Brown HOLTON AUTOMATIC: 101-A10 is noted as an issued watch for UKSF, bearing a crow's foot and NSN marking. One owner reports the dial lume is lackluster, potentially due to the vintage aesthetic influencing the choice of Super-LumiNova. Overall, owners rate the Elliot Brown HOLTON AUTOMATIC: 101-A10 for its military provenance and issued status.

Seiko Prospex Sea 1968 Heritage Diver's GMT Limited Edition

The Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition is widely praised for its excellent quality and finishing for its price, with reviewers highlighting its beautiful case, bracelet, and Lumibrite lume. Owners appreciate the comfortable 42mm case size and the 4 o'clock crown position. The watch features a sapphire crystal and uses the in-house 6R54 automatic movement with a three-day power reserve. Some reviewers note that the GMT function is secondary and that the bezel clicks are quieter than expected. The 4:30 date window splits opinion among enthusiasts, and it is described as a "caller GMT" rather than a true "traveller GMT." Overall, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition highly for its excellent value, quality finishing, and comfortable wearability.

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