Side by side

Praesidus A-5 UDTvsTudor Black Bay One 31

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

A-5 UDT
PraesidusA-5 UDT
MSRP $645
Black Bay One 31
TudorBlack Bay One 31
MSRP $4,600

At a glance

13 of 29 specs differ
Diameter
A-5 UDT38mm
Black Bay One 3131mm
Power Reserve
A-5 UDT40h
Black Bay One 3150h
Water Resistance
A-5 UDT200m
Black Bay One 31100m
MSRP
A-5 UDT$645
Black Bay One 31$4,600

Full specifications

Case

8 specs
Diameter
38mm
31mm
Thickness
9.5mm
Lug-to-Lug
46mm
Lug Width
20mm
17mm
Material
316L Stainless Steel
Stainless Steel
Finish
Brushed and polished
Polished + Satin
Water Resistance
200m
100m
Caseback
Solid
Solid screw-down

Crystal & Dial

2 specs
Crystal
Domed Sapphire
Sapphire
Dial Color
Blue
Anthracite

Movement

2 specs
Caliber
Miyota 9015
MT5201
Power Reserve
40h
50h

Pricing

1 specs
MSRP
$645
$4,600

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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.

Praesidus A-5 UDT

The Praesidus A-5 UDT is noted for its historically inspired design, featuring an oversized crown cap and chain that pays homage to WW2 canteen watches. Reviewers highlight its functional dial with embossed, Super-LumiNova filled numerals and markers for legibility, alongside 200m water resistance and a 38mm brushed stainless steel case. Some owners find the 11.7mm thickness problematic, describing it as disproportionately tall. The watch's ana/digi functionality and connection to special operations forces are also praised. On balance, owners and reviewers appreciate the Praesidus A-5 UDT for its unique historical design elements and functional dial.

Tudor Black Bay One 31

Owners widely report the Tudor Black Bay One 31's polished case and bracelet scratch easily, though its wearability under gloves and robust movement are praised. Some desire more micro-adjustment options on the clasp, and a lack of contrast between the silver dial and hands is noted. The 31mm size may be a consideration for daily wear due to its 50-hour power reserve. On balance, owners and reviewers appreciate the Tudor Black Bay One 31 for its comfortable wearability and robust movement, despite concerns about case scratching and clasp adjustability.

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