Glossary · Materials
Vitello Vache Naturel
Definition
Vitello Vache Naturel is Hermès's signature leather: natural calf, vegetable tanning, minimalist finish that highlights the original grain. No superficial treatments—pure leather that ages beautifully. I use it in our luxury watch straps because it has a rare characteristic: constructive versatility. You can work it both in thin gauge (for dress watches, Patek Philippe 5000-5100, thin calibres) and structured thickness (for Rolex Daytona, IWC Portugieser in 20-22mm). The natural patina it develops over time is what collectors seek—not burnished, not tinted, simply leather that breathes. Vegetable tannin tanning guarantees structural integrity. On an Omega Seamaster or Tudor Black Bay 20mm, this leather offers the understated elegance that distinguishes those who know the material. Conscious maintenance: neutral soap only, no aggressive oils.
Frequently asked questions
Can I mount a Vitello Vache Naturel strap on a Rolex Submariner or Datejust?
Yes, it's the most natural choice. Vitello Vache Naturel on 18-20mm Rolex (classic 36mm Datejust) creates a rare harmony between sportiness and understated elegance. On a 40mm Submariner with 20mm lugs, the contrast between the case's rigidity and the softness the leather develops over time becomes a personal signature. At Milano Straps we work the spring bars with Rolex precision: tight tolerance, no improvisation.
How does Vitello Vache Naturel age? Does it darken like Barenia?
No, it's the philosophical opposite of Barenia. While Barenia (also Hermès) darkens dramatically with oily patina, Vache Naturel evolves more gently: the grain becomes more pronounced, natural nuances emerge, texture enriches. On a 20mm IWC Portugieser in Vache Naturel, after two years you see leather with history, but it maintains luminosity. It's not a surprise transformation—it's continuous, conscious. That's why collectors choose it for watches they wear daily.
Is it water and sweat resistant like other calf leathers for sport straps?
Vitello Vache Naturel vegetable tanning makes it solid, but not waterproof like structured Horween Chromexcel. It's a conscious choice: you lose total water-resistance, gain elegance and natural aging. On a 20-22mm Omega Seamaster, I recommend it for predominantly daytime use, office dress-code or dinner. If you're diving your Seamaster in the Maldives or underwater, then I suggest rubber or Horween. In our atelier we always make this distinction with the client.
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