Side by side

Tudor Black Bay One 31 S&GvsLongines MASTER COLLECTION MOONPHASE

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

Black Bay One 31 S&G
TudorBlack Bay One 31 S&G
MSRP $6,850
MASTER COLLECTION MOONPHASE
LonginesMASTER COLLECTION MOONPHASE
MSRP $3,500

At a glance

19 of 29 specs differ
Diameter
Black Bay One 31 S&G31mm
MASTER COLLECTION MOONPHASE34mm
Power Reserve
Black Bay One 31 S&G50h
MASTER COLLECTION MOONPHASE
Water Resistance
Black Bay One 31 S&G100m
MASTER COLLECTION MOONPHASE30m
MSRP
Black Bay One 31 S&G$6,850
MASTER COLLECTION MOONPHASE$3,500

Full specifications

Case

8 specs
Category
Moonphase
Diameter
31mm
34mm
Thickness
9.5mm
11.2mm
Lug-to-Lug
46mm
49.7mm
Lug Width
17mm
21mm
Finish
Polished + Satin
Water Resistance
100m
30m
Caseback
Solid screw-down

Crystal & Dial

4 specs
Crystal Shape
Flat
AR Coating
Inner
Dial Color
Black
Silver
Indices
Applied

Movement

6 specs
Caliber
MT5201
L899.5
Beat Rate
28,800 vph
0 vph
Power Reserve
50h
0h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No

Pricing

1 specs
MSRP
$6,850
$3,500

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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.

Tudor Black Bay One 31 S&G

The Tudor Black Bay One 31 S&G is praised for its quiet luxury, combining brushed steel and warm gold accents for understated charm. Owners appreciate the brushed gold for a casual two-tone look and the champagne dial's surprising legibility. Some find the case sides too thick, and one user expressed a desire for a smaller S&G variant. The watch features the MT5612 movement with a 70-hour power reserve and a date function, within a 200-meter water-resistant case. Overall, owners and reviewers highlight the Tudor Black Bay One 31 S&G's balanced two-tone aesthetic as its primary appeal.

Longines MASTER COLLECTION MOONPHASE

Owners widely praise the Longines Master Collection Moonphase for its beautiful, legible, and mesmerizing dial, with one owner noting it balances class and complexity. The watch offers old-world charm and a romantic moonphase complication, with the Caliber L899 movement providing a 64-hour power reserve. Some owners find the $3k price point high, suggesting better value exists elsewhere, while others acquired it for around $1700 USD. One owner notes the 40mm size is a perfect fit for a 6.75-inch wrist, though its limited water resistance makes it unsuitable for adventurous wear. On balance, the consensus is that the Longines Master Collection Moonphase is highly regarded for its classic design and attractive moonphase complication at its price point.

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