Side by side

Serica Ref. 5303 Diving ChronometervsGrand Seiko SBGJ237

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
SBGJ237
Grand SeikoSBGJ237
MSRP $7,600

At a glance

12 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
SBGJ23744.2mm
Power Reserve
Ref. 5303 Diving Chronometer42h
SBGJ23755h
Water Resistance
Ref. 5303 Diving Chronometer300m
SBGJ237200m
MSRP
Ref. 5303 Diving Chronometer$1,768
SBGJ237$7,600

Full specifications

Case

6 specs
Category
Diver
GMT
Diameter
39mm
44.2mm
Thickness
12.2mm
14.4mm
Lug-to-Lug
46.5mm
50.6mm
Lug Width
20mm
21mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
Dial Color
Enamel Black
Black
Lume
Super-LumiNova
None

Movement

3 specs
Caliber
M100 COSC
9S86
Power Reserve
42h
55h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$7,600

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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.

Grand Seiko SBGJ237

Grand Seiko SBGJ237 owners and reviewers praise its impeccable finishing, Hi-Beat 36,000vph movement, and functional GMT complication. The watch is noted for its good value at €7,000, featuring a stainless steel bracelet with alternating brushed and polished surfaces, and a sapphire bezel with a day/night indicator. Reviewers highlight the lovely lume and the bezel's vintage-inspired, asymmetric color split, which uses LumiBrite for low-light legibility. The 9S86 Hi-Beat movement offers impressive accuracy of -5 to +3 seconds per day and a 55-hour power reserve. The SBGJ237 boasts 200-meter water resistance. However, the 44.2mm case size, measuring 14.4mm thick, may require slightly larger wrists, and its elevated crystal and less prominent bezel contribute to a thickness that might feel less substantial in person. Overall, owners and reviewers highly regard the Grand Seiko SBGJ237 for its combination of finishing, movement technology, and GMT functionality at its price point.

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