Side by side

Grand Seiko SBGA427vsSeiko King Seiko KSK

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

SBGA427
Grand SeikoSBGA427
MSRP $5,800
King Seiko KSK
SeikoKing Seiko KSK
MSRP $3,300

At a glance

11 of 29 specs differ
Diameter
SBGA42739mm
King Seiko KSK38.6mm
Power Reserve
SBGA42772h
King Seiko KSK45h
Water Resistance
SBGA427100m
King Seiko KSK50m
MSRP
SBGA427$5,800
King Seiko KSK$3,300

Full specifications

Case

4 specs
Diameter
39mm
38.6mm
Thickness
12.3mm
10.7mm
Lug-to-Lug
46.8mm
45.8mm
Water Resistance
100m
50m

Crystal & Dial

2 specs
Crystal Shape
Flat
Box
AR Coating
Yes
Anti-reflective coating on inner surface

Movement

4 specs
Caliber
9R65
6L35
Type
Spring Drive
Automatic
Power Reserve
72h
45h
Jewels
25
26

Pricing

1 specs
MSRP
$5,800
$3,300

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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 SBGA427

Grand Seiko SBGA427 owners widely praise its extensive Zaratsu polishing and the "hall of mirrors" effect created by its diamond-cut indexes, complemented by a subtle, reeded dial and a striking green seconds hand. The 39mm case is noted for its comfortable, tapered bracelet, and the 9R65 Spring Drive movement is visible through the caseback. Some owners report the highly polished Zaratsu finish is prone to scuffs and scratches, with one mentioning a scratch near 1 o'clock. The Grand Seiko SBGA427 sold for $3750. Overall, owners rate the Grand Seiko SBGA427 highly for its exceptional finishing and the unique visual appeal of its dial and indexes.

Seiko King Seiko KSK

Owners and reviewers widely praise the King Seiko KSK for its exceptional dial and case finishing, often compared to higher-end brands, and its slim, retro design. The use of the Calibre 6L35 movement in some variants is seen as a significant upgrade, contributing to a refined feel, while others note the bracelet is unusually nice and the case offers a mix of brushed and polished finishes with sharp angles. However, some owners question the value proposition, citing misaligned screws and clasp components on their examples, and the standard 6R movement in some models is criticized as a disappointment for the price point. Accuracy figures range from +15/-10 seconds per day to +5 to +7 seconds per day, and water resistance is rated at 5 BAR or 50 meters. Overall, owners and reviewers find the King Seiko KSK to be a beautiful and classy watch with fantastic finishing, though some are divided on its value and movement choice at its price point.

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