Side by side

Borealis Watch Co. SintravsSeiko King Seiko KSK

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

Sintra
Borealis Watch Co.Sintra
MSRP $650
King Seiko KSK
SeikoKing Seiko KSK
MSRP $3,300

At a glance

13 of 29 specs differ
Diameter
Sintra41.50mm
King Seiko KSK38.6mm
Power Reserve
Sintra40h
King Seiko KSK45h
Water Resistance
Sintra200m
King Seiko KSK50m
MSRP
Sintra$650
King Seiko KSK$3,300

Full specifications

Case

6 specs
Category
Sport
Dress
Diameter
41.50mm
38.6mm
Thickness
12.95mm
10.7mm
Lug-to-Lug
47.00mm
45.8mm
Lug Width
20mm
19mm
Water Resistance
200m
50m

Crystal & Dial

3 specs
Crystal Shape
Flat
Box
AR Coating
Inner
Anti-reflective coating on inner surface
Lume
BGW9
None

Movement

3 specs
Caliber
Miyota 9015
6L35
Power Reserve
40h
45h
Jewels
25
26

Pricing

1 specs
MSRP
$650
$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.

Borealis Watch Co. Sintra

Borealis Watch Co. Sintra owners widely praise its well-executed design, featuring applied indices and a shimmering blue dial that some prefer over more expensive alternatives. The timepiece is noted for excellent build quality and high-end specifications for its price, including a Miyota 90S5 movement and a premium bracelet. One owner did not purchase due to its size not being 39mm or less, while the 90xx movements are considered reliable and accurate, though some find them noisy. On balance, owners rate the Borealis Watch Co. Sintra highly for its impressive design and build quality at its price point.

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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