Glossary · Materials
Vegetable-Tanned Leather
Definition
Vegetable-tanned leather is the hide I reach for when I want pure craft heritage. Badalassi Carlo, the Florentine tannery that dominates this technique, produces extraordinary skin: tanned with pure vegetable tannins, no synthetic chrome. The result is living matter that ages magnificently, developing natural golden patina over years. For watch straps, it's ideal because the fiber stays compact, elastic, resistant to daily wear. It works beautifully on Rolex Datejust 36mm or vintage Omega Seamaster – straps in 18-20mm where structural integrity matters. Vegetable-tanned leather has memory: it remembers wrists, curves, your habits. It's not pigmented hide: you can watch it breathe, transform. It demands conscious maintenance – not pretreated like Hermès – but that's precisely what makes it authentic. Those who choose vegetable tan choose awareness, not convenience.
Frequently asked questions
Why Badalassi Carlo for vegetable-tanned leather?
Badalassi is Florentine excellence in vegetable tanning for nearly 150 years. They control every phase: from raw hide selection to natural fermentation in wooden vats, to manual pressing. Badalassi vegetable tan has dense, uniform fiber that on a Datejust 36mm strap or IWC Pilot 21mm develops unmatched patina. It's not industrial. It's craft.
Vegetable-tanned leather on which watch?
Perfect on dress watches and vintage sports: Rolex Datejust, Submariner (18-20mm), Omega Seamaster, Patek Philippe Calatrava, IWC Pilot, Tudor Black Bay. Even on Seiko Prospex 20-22mm for those who love the 'vintage rethink' effect. Vegetable-tanned leather mirrors the watch's style: it matures alongside it. It's not a 'universal' leather – it's a hide that tells a conscious choice.
Maintenance: how to preserve the patina?
Vegetable-tanned leather demands time and attention. Avoid stagnant water, but don't fear natural rain – it improves it. Once monthly, gently brush with a leather eraser and clean with a damp cloth. Every 6-8 months, treat with natural wax (light mink oil type) to hydrate the fiber without sealing it. The patina is your value: protect that, not the initial color. On a Datejust 36mm, a cared-for vegetable tan after 3 years is completely different skin – richer, deeper, more yours.
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only