Side by side

Serica Ref. 5303 Diving ChronometervsBremont ALT1-C

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
ALT1-C
BremontALT1-C
MSRP $6,150

At a glance

14 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
ALT1-C43mm
Power Reserve
Ref. 5303 Diving Chronometer42h
ALT1-C40h
Water Resistance
Ref. 5303 Diving Chronometer300m
ALT1-C100m
MSRP
Ref. 5303 Diving Chronometer$1,768
ALT1-C$6,150

Full specifications

Case

7 specs
Category
Diver
Chronograph
Diameter
39mm
43mm
Thickness
12.2mm
16mm
Lug-to-Lug
46.5mm
Lug Width
20mm
22mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
300m
100m

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Regular length (15cm - 19cm wrist size)
Lume
Super-LumiNova
None

Movement

3 specs
Caliber
M100 COSC
BE-50AE
Power Reserve
42h
40h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$6,150

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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.

Bremont ALT1-C

Owners widely praise the Bremont ALT1-C for its flawless brushed case finish, attractive cream dial with excellent contrast from anthracite sub-dials, and comfortable, balanced wearability. The watch features a well-finished strap and a movement that is a joy to wind, with precise chronograph operation. Reviewers note refined feuille hands and polished Arabic numerals with a golden tinge, balancing ruggedness with elegance. The Bremont ALT1-C averages +3 seconds per day, though one reviewer flags its 16mm height as less than ideal for under-cuff wear and describes the date window as narrow. The modified Valjoux 7750 movement's rotor spin is noticeable. Overall, owners rate the Bremont ALT1-C highly for its refined aesthetics and enjoyable user experience.

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