ISOfrane Anthracite Rubber Watch Strap

Swiss company ISOfrane initially launched this classic dive watch strap in the early 1960s. Its innovative design and material quickly made it a favored choice among the most renowned dive watch manufacturers of the 1960s and 1970s.

Reintroduced by Synchron in 2010, ISOfrane straps are now made in Italy using an improved proprietary isoprene rubber compound for even better durability and softness. These vanilla-scented straps are 100% silicone-free, hypoallergenic, and waterproof. With a ribbed underside to prevent adhesion to skin and large slots for ventilation and water drainage, they are also non-toxic and do not attract lint or dust like silicone straps.

Shown here in Anthracite (dark grey; almost black).

Material:

• Isoprene rubber (100% silicone-free)
• ISOfrane’s Retrosicuro buckle in either brushed stainless steel or black DLC (diamond-like carbon) finish

Sizing:

• Available in 20mm and 22mm
• Strap/buckle taper: 20mm/20mm, 22mm/22mm
• Thirteen sizing holes to achieve the perfect fit
• Piece length 130mm / 75mm excluding buckle
• Total length approximately 8″ excluding buckle
• Thickness tapers from 5.5mm at lug ends to 3.5mm at opposite ends

Includes:

• One free pair of strong, seamless double-flange stainless steel spring bars