The Full-Grain Cowhide Strap. Vegetable-Tanned. Black.
Full-grain cowhide is the top grade of hide — the outer layer with the natural grain left intact, not sanded or corrected. Ours is vegetable-tanned the slow, traditional way, so it ages honestly: it softens, darkens and takes on a patina instead of flaking like coated leather.
Cut, chiselled and stitched by hand by our leather artisans — 2.8mm thick, 20mm at the lug tapering to 16mm at the buckle, side-stitched in off-white thread on quick-release spring bars. This one is Black. The accessible way into a proper handmade strap.
The honest workhorse.
Full-grain wears in, not out — the everyday cowhide that earns its patina instead of faking one.
Full-grain, veg-tanned.
The top grade of hide with the grain intact, tanned the slow traditional way — it patinas and softens with wear instead of flaking.
Cut & stitched by hand.
Cut, chiselled and side-stitched by hand in off-white thread by our leather artisans — not run off a machine.
Quick-release, 20/16.
Quick-release spring bars swap it in seconds, no tools. 2.8mm thick, 20mm at the lug tapering to a 16mm buckle.
An honest price.
Real handmade full-grain leather — the easy way into the range, and the everyday workhorse to our shell cordovan.
Heads up — how a strap fits
Any 20mm-lug watch. These are 20/16 straps — 20mm where they meet the case, tapering to 16mm at the buckle, on standard quick-release spring bars. They fit our 20mm-lug cases and any other watch with 20mm lugs. (Two of our own cases are exceptions: the Bauhaus 33 runs 18mm lugs, and the Seiko-Dweller’s bracelet is integrated.)
Sold by wrist size. Pick by your measured wrist — full size chart in the Sizing & Fit tab. Between sizes? Size up.
Heads up — about the colour
Every strap is photographed under studio lighting with the colour left unedited. Screens still render tone their own way, so it may look slightly different in person. Black is the one shade that stays consistent from batch to batch.
Leather & Make
Dimensions
Buckle & Fittings
Pick your size
| Size | Wrist | Long / Short end |
|---|---|---|
| Small | 14.5 – 17.0cm | 105 / 65mm |
| Medium | 16.5 – 19.0cm | 115 / 70mm |
| Large | 18.5 – 21.0cm | 125 / 75mm |
Between sizes? Size up — e.g. a 16.8cm wrist takes Medium.
Fitting it
Quick-release spring bars are fitted — slide the tab, drop it between the lugs, release. No tools, no scratched lugs. Fits any 20mm-lug watch on standard spring bars.
Building a Seiko mod? See our complete build guide .
All photos of watches with modification parts are for illustration purposes only and are not included with the strap purchase.
Everything worth knowing before you build.
![Full Grain Cowhide Leather Strap 20/16mm [Black, Side Stitch] - Small (14.5 - 17.0cm) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts](http://luciusatelier.com/cdn/shop/files/Full-Grain-Cowhide-Leather-Strap-2016mm-Black-Side-Stitch-Small-14_5-17_0cm-Lucius-Atelier-Swiss-Quality-Seiko-Watch-Mod-Parts_1600x.jpg?v=1707419935)
![Full Grain Cowhide Leather Strap 20/16mm [Black, Side Stitch] - Small (14.5 - 17.0cm) - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts](http://luciusatelier.com/cdn/shop/files/Full-Grain-Cowhide-Leather-Strap-2016mm-Black-Side-Stitch-Small-14_5-17_0cm-Lucius-Atelier-Swiss-Quality-Seiko-Watch-Mod-Parts-2_1600x.jpg?v=1707419940)