Side by side

Orient Bambino Open HeartvsGrand Seiko SBGR321

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

Bambino Open Heart
OrientBambino Open Heart
MSRP $315
SBGR321
Grand SeikoSBGR321
MSRP $5,200

At a glance

17 of 29 specs differ
Diameter
Bambino Open Heart40.5mm
SBGR32140mm
Power Reserve
Bambino Open Heart40h
SBGR32172h
Water Resistance
Bambino Open Heart30m
SBGR321100m
MSRP
Bambino Open Heart$315
SBGR321$5,200

Full specifications

Case

7 specs
Category
Dress
Diameter
40.5mm
40mm
Thickness
12mm
13mm
Lug-to-Lug
46mm
46.6mm
Lug Width
21mm
20mm
Water Resistance
30m
100m
Caseback
Display
Solid

Crystal & Dial

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

Movement

4 specs
Caliber
FT622
9S65
Beat Rate
21,600 vph
28,800 vph
Power Reserve
40h
72h
Jewels
22
25

Pricing

1 specs
MSRP
$315
$5,200

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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.

Orient Bambino Open Heart

Owners widely praise the Orient Bambino Open Heart for its dressy style, clean dial, and reliable in-house F6724 automatic movement with hacking and hand-winding. Reviewers and owners highlight its value proposition, with one owner noting it remains a regular wear even after acquiring pricier watches. Some owners find the build quality and stock strap less premium, with one noting the mineral crystal is prone to scratching and another that the movement can be noisy. The 21mm lug width is cited as making strap swapping slightly more complicated. Overall, owners and reviewers rate the Orient Bambino Open Heart highly for its dressy aesthetic and in-house movement at its price point.

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.

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