Which is cheaper, the Sinn 556 I WT or the Formex Reef 39.5 mm?

At MSRP the Sinn 556 I WT is the cheaper of the two at $2,106, against $2,230 for the Formex Reef 39.5 mm — a $124 gap before any retailer discounting.

Which is bigger, the Sinn 556 I WT or the Formex Reef 39.5 mm?

The Formex Reef 39.5 mm wears larger at 39.5mm versus 38.5mm for the Sinn 556 I WT — a 1mm difference across the dial.

Which has better water resistance, the Sinn 556 I WT or the Formex Reef 39.5 mm?

The Formex Reef 39.5 mm is rated to 300m versus 200m for the Sinn 556 I WT.

Which has a longer power reserve, the Sinn 556 I WT or the Formex Reef 39.5 mm?

The Formex Reef 39.5 mm carries a 56-hour power reserve against 38 hours on the Sinn 556 I WT.

What movement does the Sinn 556 I WT run compared to the Formex Reef 39.5 mm?

Both watches run automatic movements — the Sinn 556 I WT uses the Sellita SW200-1 and the Formex Reef 39.5 mm uses the Sellita SW300-1.

Side by side

Sinn 556 I WTvsFormex Reef 39.5 mm

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

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Sinn 556 I WT

556 I WT

MSRP $2,106

See the full 556 I WT

Formex Reef 39.5 mm

MSRP $2,230

See the full Reef 39.5 mm

What people say

Owners + reviewers, side by side

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

Sinn 556 I WT

The Sinn 556 I WT is seen as a good value, though some owners find its stark black dial and white markers visually flat compared to more textured dials. While its minimalist design, screw-down crown, and water resistance are praised, some find the two-dimensional dial lacks visual substance. Overall, owners rate the Sinn 556 I WT well for its value and solid specifications, despite some finding its austere dial design polarizing.

WatchUSeek

Formex Reef 39.5 mm

The Formex Reef 39.5 mm is widely praised for its refined finishing, comfortable and well-proportioned case design, and impressive specifications for its price point, including COSC-certified Sellita SW300-1 movement and 300m water resistance. Owners and reviewers highlight the tool-less micro-adjust clasp and quick-release spring bars as practical features. Some reviewers note that the 22mm lug width feels slightly disproportionate to the smaller case, and the bracelet could benefit from more taper, though this is a point of contention for some owners who value the overall package. A prototype crown protrusion issue is noted as being addressed for production. On balance, owners and reviewers rate the Formex Reef 39.5 mm highly for its excellent value and well-executed design.

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