Side by side

Serica Ref. 5303 Diving ChronometervsJack Mason Ellum Manual Wind

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
Ellum Manual Wind
Jack MasonEllum Manual Wind
MSRP $799
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.

Jack Mason Ellum Manual Wind

The Jack Mason Ellum Manual Wind is widely praised for its elegant, mid-century inspired design, featuring a beautiful linen-textured dial and a slim, wearable 38mm case. Owners and reviewers highlight its refined aesthetic, with some specifically calling out the gold textured dial as a favorite. The Sellita SW210-1 manual-wind movement is noted for its smooth operation and accuracy, with multiple sources reporting it regulated to within ±5 seconds per day. The watch is available at a value price point, ranging from $799 to $949 across different sources. Some owners are split on the date window, with a few finding it disruptive to the dial's design, and one commenter found the logo unappealing, while others consider the dimensions and overall package a home run. Overall, owners and reviewers rate the Jack Mason Ellum Manual Wind highly for its attractive dial and slim case at the price.

At a glance

12 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Ellum Manual Wind38mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Ellum Manual Wind42h
Water Resistance
Ref. 5303 Diving Chronometer300m
Ellum Manual Wind50m
MSRP
Ref. 5303 Diving Chronometer$1,768
Ellum Manual Wind$799

Full specifications

Case

5 specs
Category
Diver
Diameter
39mm
38mm
Thickness
12.2mm
9mm
Lug-to-Lug
46.5mm
45mm
Water Resistance
300m
50m

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Lume
Super-LumiNova
None

Movement

3 specs
Caliber
M100 COSC
Sellita SW210-1
Type
Automatic
Manual
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$799
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