Side by side

Serica Ref. 5303 Diving ChronometervsSeestern S446 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
S446 GMT
SeesternS446 GMT
MSRP $299

At a glance

16 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
S446 GMT39.5mm
Power Reserve
Ref. 5303 Diving Chronometer42h
S446 GMT41hh
Water Resistance
Ref. 5303 Diving Chronometer300m
S446 GMT100m
MSRP
Ref. 5303 Diving Chronometer$1,768
S446 GMT$299

Full specifications

Case

6 specs
Category
Diver
GMT
Diameter
39mm
39.5mm
Thickness
12.2mm
13mm
Lug-to-Lug
46.5mm
47mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
300m
100m

Crystal & Dial

4 specs
Crystal Shape
Flat
Domed
AR Coating
Yes
Inner
Dial Color
Enamel Black
Cream
Lume
Super-LumiNova
None

Movement

5 specs
Caliber
M100 COSC
Seiko NH34A GMT
Beat Rate
28,800 vph
3 vph
Power Reserve
42h
41hh
Jewels
25
24
Complications
COSC
GMT, Date

Pricing

1 specs
MSRP
$1,768
$299

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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.

Seestern S446 GMT

Owners widely praise the Seestern S446 GMT for its stunning finishing and extreme value, with a sapphire crystal and adjustable clasp. The winding action is noted as buttery smooth, and the 39.5mm case size is considered very wearable. Some owners, however, flag the lume as a weak point and one owner found the bracelet clasp lacked sufficient micro-adjustment. The Seestern S446 GMT is considered an extreme value for the dollar. Overall, owners rate the Seestern S446 GMT highly for its exceptional finishing and value proposition at its price point.

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