Method

What this is

A reference of watch dimensions and movements for people who want the numbers before buying. It is not a shop, a ranking or a lifestyle guide.

It is a pilot. It currently covers a growing set of references from the brands listed on the Brands page, and it grows by adding sourced data, not by estimating.

Source types

Every figure is tagged with one of three source types, and the type is always displayed next to it.

• Official: the brand’s own product page or documentation.
• Third-party: a retailer, a magazine or a review site that gives the figure for this model or reference.
• Community: forum posts or user-maintained lists. Useful when nothing else exists, but unverified.

Observations, not one clean number

Thickness, lug width and lug-to-lug are stored as a list of observations. Each has a value, a type, a publisher, a link and a retrieval date.

Nothing is averaged or overwritten. If a brand states 13.6 mm and a review site 12.7 mm, both appear and the page says they disagree.

Some third-party figures are model-level, meaning one number for a whole family. Those are labelled as such in the note on the observation.

Disagreement tolerances

Two observations of the same field are treated as agreeing when they differ by no more than these values.

Conservative choice for filters and fit

When several values exist, filters and fit checks use the larger one. The aim is that an oversized watch is never reported as fitting because one source rounded down.

Lug width and lug-to-lug

Lug width is the gap between the lugs where the strap attaches. In French this is the “entre-cornes” and in German the “Bandanstoß”.

Lug-to-lug is the length from the tip of one lug to the tip of the other along the 12–6 axis. In French “cornes à cornes” and in German “Horn zu Horn”, though all three languages also use the English term. It is the figure that decides fit.

How the wrist-fit estimate works

The flat top of a wrist is estimated as 0.318 times its circumference, so a 17 cm wrist gives about 54 mm. If you have measured the flat top yourself, enter it and it replaces the estimate.

The watch’s lug-to-lug is divided by that width. Below 75% the watch may look small. From 75% to 95% is the usual comfortable range. From 95% to 100% the lugs reach the edge. Above 100% they overhang.

Wrist shapes vary a lot, so treat the result as a first filter and try the watch if you can.

flat top = 0.318 × circumference

Where the fit rules come from

The ratio bands are rules of thumb taken from watch-fit guides, not measurements of bodies. They are a screening tool, not a verdict.

• Jamais Vulgaire (jamaisvulgaire.com). Flat top of the wrist as a fraction of its circumference (0.318 here).
• The Slender Wrist (theslenderwrist.com). Comfortable range as a share of the flat top.
• Majestix Collection (majestixcollection.com). Lug-to-lug beyond the wrist width by more than 3 to 4 mm lets the lugs hang past the edges.

Known limits of the pilot

• Omega, Seiko and Grand Seiko publish lug-to-lug on their product pages, Hamilton does for some references. Rolex, Tudor, Longines, Tissot, Breitling and Oris do not, so for them the figures come from third parties and forums, and many references have none yet.
• Oris pages give neither thickness nor lug-to-lug. Grand Seiko publishes a “band width” and Oris an “interhorn width”: both are shown as lug width.
• Tissot publishes a lug width of 12 or 13 mm for the PRX: its bracelet is integrated, so that figure is not a standard strap width.
• Rolex pages in the pilot give no thickness or lug width. Longines pages give neither, and often do not name the calibre.
• Frequencies for Rolex, Tudor, Tissot and most Seiko calibres are left empty because none of the pages collected states them.
• Descriptive fields such as dial, bracelet and price are out of scope.
• The data was collected by reading product pages one at a time, so it can lag behind brand updates.

Corrections

If a figure is wrong or you have a better source, send the reference and a link to it.