Which is cheaper, the Hamilton Jazzmaster Thinline Auto or the Formex Reef 42 mm?

At MSRP the Hamilton Jazzmaster Thinline Auto is the cheaper of the two at $1,145, against $2,414 for the Formex Reef 42 mm — a $1,269 gap before any retailer discounting.

Which is bigger, the Hamilton Jazzmaster Thinline Auto or the Formex Reef 42 mm?

The Formex Reef 42 mm wears larger at 42mm versus 40mm for the Hamilton Jazzmaster Thinline Auto — a 2mm difference across the dial.

Which has better water resistance, the Hamilton Jazzmaster Thinline Auto or the Formex Reef 42 mm?

The Formex Reef 42 mm is rated to 300m versus 50m for the Hamilton Jazzmaster Thinline Auto.

Which has a longer power reserve, the Hamilton Jazzmaster Thinline Auto or the Formex Reef 42 mm?

The Formex Reef 42 mm carries a 56-hour power reserve against 42 hours on the Hamilton Jazzmaster Thinline Auto.

What movement does the Hamilton Jazzmaster Thinline Auto run compared to the Formex Reef 42 mm?

Both watches run automatic movements — the Hamilton Jazzmaster Thinline Auto uses the 2892-A2 and the Formex Reef 42 mm uses the Sellita SW300-1.

Side by side

Hamilton Jazzmaster Thinline AutovsFormex Reef 42 mm

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

Hamilton Jazzmaster Thinline Auto

h38525121

MSRP $1,145

Formex Reef 42 mm

reef-42mm-automatic-cosc-300m-black

MSRP $2,414

At a glance

11 of 29 specs differ

Diameter

Jazzmaster Thinline Auto40mm

Reef 42 mm42mm

Power Reserve

Jazzmaster Thinline Auto42h

Reef 42 mm56h

Water Resistance

Jazzmaster Thinline Auto50m

Reef 42 mm300m

MSRP

Jazzmaster Thinline Auto$1,145

Reef 42 mm$2,414

Full specifications

Case

6 specs

Crystal & Dial

2 specs

Dial Color

Beige

Black

Lume

None

Super-LumiNova

Movement

2 specs

Caliber

2892-A2

Sellita SW300-1

Power Reserve

42h

56h

Pricing

1 specs

MSRP

$1,145

$2,414

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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.

Hamilton Jazzmaster Thinline Auto

Owners widely praise the Hamilton Jazzmaster Thinline Auto for its gorgeous, stunning, and captivating dials, particularly the champagne and burgundy variants, and its thin, comfortable profile, often noted at around 7mm to 8.4mm, making it ideal for wearability under shirt cuffs. The ETA 2892 movement is considered a strong value, though some owners report the rotor can be noisy and the winding feel unrefined, while others find the small crown difficult to manipulate. The absence of a second hand is polarizing, with some appreciating the simplicity and ease of setting, while others miss its presence. Overall, owners rate the Hamilton Jazzmaster Thinline Auto highly for its attractive, thin design and dial beauty at its price point.

From video reviewers

The slim case profile and affordable price point are consistently praised. Reviewers noted the absence of a second hand.

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Formex Reef 42 mm

The Formex Reef 42 mm is widely praised for its comfortable bracelet featuring a micro-adjust clasp, COSC-certified Sellita movement, and excellent build quality. Owners appreciate the gradient dial's visual appeal and the overall wearability. Some owners note the seconds hand does not perfectly align with markers, and one owner found the lugs' taper hinders third-party strap fit. The bracelet's length and sporty design are noted as limiting versatility by some. On balance, owners and reviewers rate the Formex Reef 42 mm highly for its impressive wearability and value at the price point.

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