Side by side

Grand Seiko STGK031vsZelos Comet 39

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

STGK031
Grand SeikoSTGK031
MSRP $6,600
Comet 39
ZelosComet 39
MSRP $2,499

At a glance

13 of 29 specs differ
Diameter
STGK03130mm
Comet 3939mm
Power Reserve
STGK03150h
Comet 3940h
Water Resistance
STGK031100m
Comet 3950m
MSRP
STGK031$6,600
Comet 39$2,499

Full specifications

Case

6 specs
Diameter
30mm
39mm
Thickness
10.5mm
7.6mm
Lug-to-Lug
36.2mm
39mm
Lug Width
15mm
20mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
100m
50m

Crystal & Dial

3 specs
Crystal
Sapphire
Domed Sapphire
AR Coating
Yes
Inner
Dial Color
Black
Tantalum LE

Movement

3 specs
Caliber
9S27
ETA/Peseux 7001
Type
Automatic
Manual
Power Reserve
50h
40h

Pricing

1 specs
MSRP
$6,600
$2,499

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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.

Grand Seiko STGK031

Grand Seiko STGK031 owners widely praise its subtle, light pink dial that shifts to appear white or silver depending on lighting, its refined 30mm case size, and its simple elegance. Some find the 30mm sizing perfect for wearability, with one owner noting it is ideal for those who find 38mm watches too large. The Zaratsu polishing is also a noted strength. However, the Calibre 9S27 movement has a 50-hour power reserve and an accuracy range of +8 to -3 seconds per day, which some consider modest for the price. On balance, owners and reviewers rate the Grand Seiko STGK031 highly for its versatile dial and refined 30mm case.

From video reviewers

The 50-hour power reserve of the Calibre 9S27 movement is a shared strength. The 36mm lug-to-lug measurement is a weakness. Reviewers disagreed on the premium feel of the polished stainless steel case and bracelet compared to Zaratsu polishing.

Zelos Comet 39

Owners widely praise the Zelos Comet 39 for its wearable 39mm size, thin profile under 10mm thanks to its manual-wind Sellita SW215 movement, and its captivating dial with a deep starburst effect. The winding action is described as a joy, and the watch is considered a stunner for its price, blending modern and vintage aesthetics. Some owners note frustration with Zelos's limited production runs leading to quick sell-outs. One owner found the logo childlike, while another experienced strap-rubbing issues with the short lugs, which were resolved with a Milanese bracelet. Overall, owners and reviewers rate the Zelos Comet 39 highly for its excellent value and striking dial design.

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