Side by side

Serica Ref. 5303 Diving ChronometervsGruppo Gamma Field III GMT

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

Ref. 5303 Diving Chronometer
SericaRef. 5303 Diving Chronometer
MSRP $1,768
Field III GMT
Gruppo GammaField III GMT
MSRP $459

At a glance

11 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Field III GMT40mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Field III GMT41h
Water Resistance
Ref. 5303 Diving Chronometer300m
Field III GMT200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Field III GMT$459

Full specifications

Case

6 specs
Category
Diver
GMT
Diameter
39mm
40mm
Thickness
12.2mm
14mm
Lug-to-Lug
46.5mm
48.5mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

1 specs
Dial Color
Enamel Black
Black

Movement

3 specs
Caliber
M100 COSC
Seiko Instruments NH38A
Power Reserve
42h
41h
Complications
COSC
GMT

Pricing

1 specs
MSRP
$1,768
$459

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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.

Serica Ref. 5303 Diving Chronometer

Owners widely praise the Serica Ref. 5303 Diving Chronometer for its excellent wearability, definitive style, and smooth, confident bezel action. The dual scale on the bezel is noted as surprisingly useful, and the crown action, winding, and hacking are reported to work perfectly. One owner describes the Serica 5303-3 as gorgeous and unique, though another notes the crown can appear comically large. On balance, owners rate the Serica Ref. 5303 Diving Chronometer highly for its blend of unique design and robust functionality.

Gruppo Gamma Field III GMT

Owners praise the Gruppo Gamma Field III GMT for its look and value, with specific mentions of its sandwich dial and comfortable OEM straps. One owner notes incredible quality for the price across their Gruppo Gamma watches. The watch features a 40mm brushed stainless steel case, box sapphire crystal, and a Seiko NH34A movement with a 41-hour power reserve and stated accuracy of -20~+40 s/day. Some find the lack of a date window a drawback for a GMT, and question its differentiation from other NH34-powered watches. On balance, owners and reviewers find the Gruppo Gamma Field III GMT to be a good value with quality construction for its price point.

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