Side by side

IWC Schaffhausen Iw459403 Portofino Automatic Moon PhasevsGrand Seiko SBGR321

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

SBGR321
Grand SeikoSBGR321
MSRP $5,200
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 Iw459403 Portofino Automatic Moon Phase

Owners widely praise the IWC Schaffhausen Portofino for its stunning and elegant design, with many finding the 40mm size wearability excellent, even on smaller wrists. The clean dial and classical sophistication are frequently highlighted, and some owners describe it as a "lifetime watch." One owner notes their watch keeps excellent time, with another mentioning IWC's commitment to chronometer standards. A different Portofino 37 variant was reported to lose almost 10 seconds a day. On balance, owners and reviewers rate the IWC Schaffhausen Portofino highly for its elegant design and comfortable wearability.

Grand Seiko SBGR321

Grand Seiko SBGR321 owners and reviewers widely praise its attractive design, compelling dimensions, and robust movement. The watch features sharp case lines with contrasting brushing and polishing, a 40mm steel case that provides presence without bulk, and 100m water resistance. Its sunburst blue dial, inspired by the dawn sky over Mount Iwate, showcases Grand Seiko's signature finishing on applied markers and hands, with a red-tipped seconds hand. The 9S65 automatic movement is noted for its precision, running within specifications, with one source reporting a +5 to -3 seconds a day rate and a 3-day power reserve. A blue rotor with a crimson rim, also inspired by Mount Iwate, is visible through the display caseback. On balance, owners and reviewers rate the Grand Seiko SBGR321 highly for its exceptional finishing and compelling blue dial design at its price point.

At a glance

15 of 29 specs differ
Diameter
Iw459403 Portofino Automatic Moon Phase40mm
SBGR32140mm
Power Reserve
Iw459403 Portofino Automatic Moon Phase50h
SBGR32172h
Water Resistance
Iw459403 Portofino Automatic Moon Phase30m
SBGR321100m
MSRP
Iw459403 Portofino Automatic Moon Phase$7,700
SBGR321$5,200

Full specifications

Case

6 specs
Category
Moonphase
Dress
Thickness
11.1mm
13mm
Lug-to-Lug
46.6mm
Finish
18 ct 5N gold
Brushed and polished
Water Resistance
30m
100m
Caseback
Solid

Crystal & Dial

5 specs
Crystal
Sapphire
Crystal Shape
Flat
AR Coating
Yes
Dial Color
Silver
Black
Indices
Applied

Movement

3 specs
Caliber
35800
9S65
Power Reserve
50h
72h
Complications
Moonphase
None

Pricing

1 specs
MSRP
$7,700
$5,200
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