This is the Cassis Grenoble. It's a sweat-resistant strap with Lorica, a waterproof material, on the back. Specifications: ・Material: Surface / Calfskin (vegetable-tanned Tuscan leather), Back / Lorica ・Color: Gray (slightly brownish) ・Width: Lug width / 20mm, Buckle width / 16mm ・Length: Tip side / 115mm, Buckle side / 75mm ・Thickness: Approximately 3mm ※ Easy-to-install quick-release spring bar. Originally a vintage specification, there are minor scratches and marks from the deployant buckle. Please refrain from purchasing if you are sensitive to these details. ※ We do not accept returns or exchanges to prevent product substitution.