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IWC Schaffhausen Iw357415 Portofino AutomaticvsSeiko King Seiko KSK

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

King Seiko KSK
SeikoKing Seiko KSK
MSRP $1,900
What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

IWC Schaffhausen Iw357415 Portofino Automatic

Owners widely praise the IWC Schaffhausen Iw357415 Portofino Automatic for its clean, classic dress watch aesthetic and elegant, minimalist design, with many appreciating its slim profile. One owner highlights the appealing blue dial color, while another notes it keeps excellent time. However, some question its value proposition, especially given the use of an external movement and its price point relative to competitors. One owner found the watch had a larger presence on the wrist than expected. Overall, owners rate the IWC Schaffhausen Iw357415 Portofino Automatic highly for its classic dress watch aesthetic and elegant design.

Seiko King Seiko KSK

The King Seiko KSK is widely praised for its refined finishing, with owners and reviewers noting its sharp case, faceted lugs, and well-executed dial indices, often comparing its polishing favorably to Grand Seiko. Enthusiasts appreciate its slim, retro design, with some stating it wears smaller than its official size due to the cushion case and close-to-the-wrist feel. The use of the slimline Calibre 6L35 movement is seen as an upgrade, maintaining the watch's slender profile, though some owners express concern over the price point and the perceived value of the movement. Accuracy figures vary, with one owner reporting +5 to +7 seconds per day, while another notes +15/-10 seconds per day. Some owners have noted minor quality control issues such as misaligned screws or a burr on a hand. On balance, owners and reviewers rate the King Seiko KSK highly for its exceptional case and dial finishing at its price point.

At a glance

16 of 29 specs differ
Diameter
Iw357415 Portofino Automatic34mm
King Seiko KSK36.1mm
Power Reserve
Iw357415 Portofino Automatic50h
King Seiko KSK72h
Water Resistance
Iw357415 Portofino Automatic30m
King Seiko KSK100m
MSRP
Iw357415 Portofino Automatic$6,500
King Seiko KSK$1,900

Full specifications

Case

7 specs
Diameter
34mm
36.1mm
Thickness
8.6mm
11.6mm
Lug-to-Lug
43mm
Lug Width
16mm
19mm
Finish
18 ct 5N gold
Brushed and polished
Water Resistance
30m
100m
Caseback
Solid

Crystal & Dial

5 specs
Crystal Shape
Box
AR Coating
Anti-reflective coating on inner surface
Dial Color
Green
Black
Indices
Applied
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
35100
6R51
Power Reserve
50h
72h
Jewels
25
24

Pricing

1 specs
MSRP
$6,500
$1,900
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