Strap for OT-3

The Dietrich OT OTCAO3 features a 20mm lug width. This measurement refers to the internal distance between the two lugs (the metal shoulders) that attach the strap to the 46mm case. To verify correct compatibility, measure from the inside of one lug to the inside of the other using a ruler or digital calliper.

For the OTCAO3, we primarily recommend genuine alligator leather in dark shades (black, deep brown, slate grey), which emphasizes the asymmetric geometry of the 46mm case. Alternatively, vegetable-tanned calf leather guarantees a fascinating aging patina, whilst a 20mm NATO strap offers sporting practicality. Vulcanized rubber represents the most contemporary choice for those wishing to emphasize the aesthetic utopia of the model.

The OTCAO3 features an unconventional attachment system. We recommend having the strap changed by a specialized watchmaker or at the Casati Milano Atelier, where our experts handle this operation with the precision required by the case's particular geometry. If you decide to proceed independently, use a spring bar tool with care, avoiding scratches to the case's brushed stainless steel.

Absolutely. Any strap with a 20mm lug width is technically compatible. However, to respect the aesthetic identity of the OTCAO3—a 46mm case with asymmetric lines—we recommend high-quality straps in natural leather or premium technical materials. Low-quality straps could compromise the visual impact of this design masterpiece. On milanostraps.it you will find a curated selection of reliable alternatives.

A quality leather strap (alligator, calf, shell cordovan) lasts an average of 3-5 years with moderate daily use. Longevity depends on usage intensity, periodic maintenance (gentle cleaning, conditioning with specific creams) and environmental conditions (humidity, sun exposure). Vegetable-tanned straps develop a fascinating patina over the years, whilst vulcanized rubber straps maintain their technical characteristics more stably over time, although they still require regular maintenance.