Side by side

Serica Ref. 5303 Diving ChronometervsBaltic Aquascaphe MK2

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
Aquascaphe MK2
BalticAquascaphe MK2
MSRP $680

At a glance

9 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Aquascaphe MK237mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Aquascaphe MK242h
Water Resistance
Ref. 5303 Diving Chronometer300m
Aquascaphe MK2200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Aquascaphe MK2$680

Full specifications

Case

4 specs
Diameter
39mm
37mm
Thickness
12.2mm
12.9mm
Lug-to-Lug
46.5mm
45mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
Dial Color
Enamel Black
Blue
Lume
Super-LumiNova
BGW9

Movement

2 specs
Caliber
M100 COSC
Miyota 9039
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$680

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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.

Baltic Aquascaphe MK2

The Baltic Aquascaphe MK2 is widely praised for its refined case design, improved lume with applied markers, and added crown guards, presenting a sharper and more purposeful neo-retro dive watch. Owners and reviewers highlight its updated technical and design elements, including a fully graduated sapphire bezel and two case size options (37mm and 39.5mm), all while maintaining a reasonable price point. Some find the design derivative or less cohesive than its predecessor, with one owner noting the long, straight lugs as a significant drawback, while others appreciate the dial texture and case profile. The Baltic Aquascaphe MK2 is powered by the Miyota 9039 movement with a 42-hour power reserve and offers 200m water resistance. Overall, owners and reviewers rate the Baltic Aquascaphe MK2 highly for its value and contemporary updates to a tool-watch heritage.

From video reviewers

The Baltic Aquascaphe MK2 features 3D Super-LumiNova indexes for improved legibility. A notable weakness is the lack of lume brightness. Reviewers disagree on the optimal case size, with one reviewer noting a 41mm stainless steel case is comfortable for everyday wear, while the other mentions 37mm and 39.5mm case sizes are available.

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