Side by side

Marathon JDD (Jumbo Day/Date) Anthracite Diver's AutomaticvsPhoibos Reef Master

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

JDD (Jumbo Day/Date) Anthracite Diver's Automatic
MarathonJDD (Jumbo Day/Date) Anthracite Diver's Automatic
MSRP $3,250
Reef Master
PhoibosReef Master
MSRP $335

At a glance

10 of 29 specs differ
Diameter
JDD (Jumbo Day/Date) Anthracite Diver's Automatic46mm
Reef Master42mm
Power Reserve
JDD (Jumbo Day/Date) Anthracite Diver's Automatic40h
Reef Master40h
Water Resistance
JDD (Jumbo Day/Date) Anthracite Diver's Automatic300m
Reef Master200m
MSRP
JDD (Jumbo Day/Date) Anthracite Diver's Automatic$3,250
Reef Master$335

Full specifications

Case

5 specs
Diameter
46mm
42mm
Thickness
18mm
13mm
Lug-to-Lug
55mm
48mm
Material
316L Stainless Steel (Anthracite IP)
Stainless Steel
Water Resistance
300m
200m

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
Anthracite
Black
Lume
None
Super-LumiNova

Movement

1 specs
Caliber
Sellita SW220-1
SII NH38

Pricing

1 specs
MSRP
$3,250
$335

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What people say

Owners + reviewers, side by side

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

Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic

Owners widely praise the Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic as a tough, underrated tool watch with lifestyle appeal, highlighting its robust build and tritium lume for excellent legibility. However, its 46mm size is a common criticism, with some finding it heavy and top-heavy, and the OEM rubber strap stiff. One owner noted the watch runs about 10 seconds fast after three days, and the ETA 2836-2 movement offers approximately two days of power reserve. On balance, owners and reviewers rate the Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic highly for its robust tool-watch build and legibility, despite its substantial size.

Phoibos Reef Master

Owners widely praise the Phoibos Reef Master for its exceptional value, highlighting its sapphire crystal, DLC coating, and extensive BGW9 lume. The watch is noted for its cool lume, with one owner finding it not bulky despite its robust build. The Shamrock Green dial and texture are highly praised, as is the comfortable bracelet with solid end links. However, the bezel action is described as rough, and the basic folding clasp is a disappointment. Accuracy is reported as excellent, with one owner seeing +-2 sec/day. Some find the 42mm size almost too big for their wrists, and the date window is considered too small. Overall, owners rate the Phoibos Reef Master highly for its impressive feature set and value at its price point.

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