Side by side

Hamilton Jazzmaster Open Heart AutovsTornek-Rayville Blakjak 12-hr GMT

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

Jazzmaster Open Heart Auto
HamiltonJazzmaster Open Heart Auto
MSRP $2,695
Blakjak 12-hr GMT
Tornek-RayvilleBlakjak 12-hr GMT
MSRP $895

At a glance

12 of 29 specs differ
Diameter
Jazzmaster Open Heart Auto36mm
Blakjak 12-hr GMT42.5mm
Power Reserve
Jazzmaster Open Heart Auto80h
Blakjak 12-hr GMT42h
Water Resistance
Jazzmaster Open Heart Auto50m
Blakjak 12-hr GMT200m
MSRP
Jazzmaster Open Heart Auto$2,695
Blakjak 12-hr GMT$895

Full specifications

Case

6 specs
Category
Chronograph
Diver
Diameter
36mm
42.5mm
Thickness
10mm
13.2mm
Lug-to-Lug
46mm
49mm
Lug Width
18mm
22mm
Water Resistance
50m
200m

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
Mother of pearl
Black
Lume
None
Superluminova

Movement

2 specs
Caliber
H-10
SII NH36
Power Reserve
80h
42h

Pricing

1 specs
MSRP
$2,695
$895

Follow this matchup

Get a note when Hamilton Jazzmaster Open Heart Auto vs Tornek-Rayville Blakjak 12-hr GMT gets more votes, a community discussion, or a price drop. No account needed.

What people say

Owners + reviewers, side by side

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

Hamilton Jazzmaster Open Heart Auto

The Hamilton Jazzmaster Open Heart Auto is noted for its dressy yet versatile design, featuring striking gradient dials and intricately shaped cutouts that reveal the H-10 movement. It boasts an 80-hour power reserve and Nivachron hairspring. The watch is available in 36mm, 40mm, or 42mm stainless steel cases. On balance, the Hamilton Jazzmaster Open Heart Auto is appreciated for its visually engaging dial and movement display at its price point.

From video reviewers

The smoked dial's precision cutouts offer a captivating view of the automatic movement. Legibility is compromised by the open-heart design.

Tornek-Rayville Blakjak 12-hr GMT

The Tornek-Rayville Blakjak 12-hr GMT is a 42.5mm stainless steel watch featuring a DLC-coated bezel, sapphire crystal, and a matte black dial with 12- and 24-hour scales. It is powered by a Seiko SII NH36 automatic movement, offering a 41-hour power reserve, and boasts 200 meters of water resistance. The dial includes a day/date complication and Super-LumiNova BGW9 lume. Overall, owners and reviewers highlight its robust build and functional military-inspired design as key strengths.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.