Glossary · Materials
Groppone
Definition
Groppone is the noblest and most resilient part of bovine leather, sourced from the animal's back. Characterized by compact, parallel fibers, it offers uniform thickness and a natural undulating surface that makes it unmistakable. In our atelier, we work with groppone for watch straps because it guarantees exceptional durability—it resists repeated flexing without tearing. The natural texture, with those subtle grain lines, adds aesthetic character without artificial treatments. It's the leather I prefer for clients seeking a strap that ages intentionally, developing rich patina over time. On a Rolex Submariner or Patek Aquanaut in 20-22mm size, groppone expresses pure solidity.
Frequently asked questions
Why is groppone ideal for a diving watch strap?
Groppone, sourced from the bovine back, has parallel-oriented fibers that make it extremely resistant to tension and cyclic flexing. On a Rolex Submariner or Omega Seamaster, this resistance is critical: the strap withstands repeated wrist movements without degradation. The natural thickness of groppone (2.5-3mm) also allows for a firm wrist hold, essential underwater. Moreover, the natural grain requires no artificial finishes that might peel under chlorine or saltwater.
How does groppone evolve over time and what maintenance does it require?
Groppone is a leather that embraces intentional aging. In the first months, it develops a golden or amber patina naturally, depending on the tanning type and frequency of wear. On an IWC Pilot's or Omega Seamaster Vintage, this evolution is highly appreciated by collectors. Maintenance is minimal: occasional brushing with a soft brush to remove dust, and a light vegetable oil treatment (diluted neatsfoot) once a year. Don't use heavy artificial waxes or conditioners, because groppone 'breathes' naturally.
Is groppone suitable for dress watches, or only for sports watches?
Groppone is more versatile than you might think. Yes, it excels on dive watches like the Rolex Submariner or Seamaster, but on a Patek dress Aquanaut or Jaeger-LeCoultre Reverso in 18mm size, with polished finishing and elegant stitching, it offers sophistication without losing authenticity. The difference isn't the leather, but the craftsmanship: a finer thickness (2-2.2mm), color-matched edges, and controlled patina. It's the ideal strap for those who want a robust dress watch but not an 'office watch'.
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