20 → 16 mm = 20 mm at your watch, 16 mm at the buckle. Often stamped on your old strap.
Please select your lug width.
Length
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Long end (with holes) / short end (buckle side), in mm.
Please select a length.
Buckle
A secure double-fold closure that helps preserve the leather.
Finish
Clasp details
Find your lug width
Lug width is the gap between the inner edges of your watch’s lugs, where the strap fits. Your strap must match it, in mm.
Check your current strap. The back is often stamped “20-16” or “20”, or measure its width at the watch end. Trust it only if that strap fits well.
Look up your watch model or reference online.
Measure between the lugs with a caliper or mm ruler (most reliable).
Good to know
Measure between the inner edges of the lugs, not the outer edges or across the case.
Got 19.5 or another size not listed? Choose Custom. We make any width.
Buckle width: the second number
20 → 16 mm means 20 mm at the watch and 16 mm at the buckle. The strap narrows between the two.
Copy a strap you like: use the second number stamped on its back, or measure its width right before the buckle.
Not sure? Our pairs follow the usual taper for each lug width. If yours has two options (20 → 16 or 20 → 18), the bigger step down tends to look slimmer and dressier.
1 · Wrist circumferenceWrap a tape or paper strip where you wear your watch.2 · Lug-to-lugTip to tip across the watch. Not the case diameter.
Reading a length: long end / short end Measure the leather only. The watch and the metal buckle are not included.
SizeLong / short end
S · Short105 / 65 mm
M · Standard115 / 75 mm
L · Long125 / 85 mm
The calculator suggests a length from your wrist and your watch together; the same wrist can need a different size with a larger watch. Already have a strap that fits well? Measure it the same way and choose the closest size, or Custom. See the full size chart →
How to read the result
Long end: the side with holes, from the lug end to the tip.
Short end: the buckle side, from the lug end to the buckle.
Lengths don’t include the watch or the buckle.
Enter initials or a short name, up to the displayed character limit. The text will be embossed on the leather lining. Please check spelling and capitalization before adding to cart.
Padded has a raised profile, Slim is clean and flexible, Stitchless has no visible thread, and Side-Stitch uses discreet stitching near the edges.PaddedSlimStitchlessSide-StitchSelect an image to enlarge
ThicknessWatch end → strap ends · mm
Shown as watch end → strap ends. 2.5 → 1.8 mm means 2.5 mm beside the watch, tapering to 1.8 mm toward the tip and the buckle end. If unsure, keep the recommended option.
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Enter both thickness measurements.
WidthLug → buckle · mm
Lug width is the inside gap between your watch’s lugs and must match it. We make any width, for example 19.5. Buckle width is the narrow end, an even number from 10 to 24 mm, never wider than the lug width.
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Buckle width cannot be wider than lug width.
LengthLong → short · mm
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The long end must be at least as long as the short end.
Thread colorOptional
Keep the thread in the product photos, match it to the leather, choose cream for contrast, or pick another color. Not shown for Stitchless straps.
Choose a thread colourThread samples show the colour and texture more clearly.
Choose a thread colour from the palette.
Edge colorOptional
For painted edges, match the leather or choose a contrasting color.
Choose a painted edge colour
Choose a painted edge colour.
Curved endOptional
A curved end finishes the strap end in a gentle curve (+$10). It’s a style detail: it isn’t made to match your watch case exactly, so a gap may remain.
PersonalizationOptional
Up to 10 characters, embossed inside the lining. We emboss exactly what you type, so please check spelling and capitals.
Navy is a dark, cool blue, and the sailcloth-pattern rubber gives it a fine crosshatch texture up close. This Navy Sailcloth watch strap suits blue, white, black and grey dials, and steel cases. Tone-on-tone navy stitching keeps the edges low-key.
This is our Padded style, 4.5mm at the lugs and tapering to 2.0mm, with a raised, cushioned centre that gives the strap more presence. The rubber sailcloth upper is lined with Zermatt calfskin as standard, or rubber. It is a sporty strap that suits dive watches, chronographs and larger field pieces.
Made by hand in our Da Nang workshop. The photos show it on a Grand Seiko with a white textured dial and an Omega x Swatch MoonSwatch. A silver buckle matches most steel sports watches, and black gives the navy a darker, more utilitarian look.
Strap Specification
Strap Style: Padded
Thread Colour: Tone on Tone
Strap Thickness: 4.5mm – 2.0mm
Lining: Zermatt Golden
Shipping & Delivery
Handcrafted and ready to ship within 3–7 business days.
Free Standard Shipping United States: 7–10 business days Other countries: 10–15 business days
Express Shipping: 5–8 business days; fee calculated at checkout.
Order Tracking: Every order includes a tracking number, which will be provided as soon as your order has been shipped.
We accept return and refund requests within 30 days of delivery. If there is any issue with your order, please contact our support team at support@cernir.com and we will guide you through the next steps.
