Zeitwinkel · 39mm Midsize

Strap for 081° Blue

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width18 mm
Case diameter39 mm
Reference081° Blue
Family39mm Midsize
MovementZeitwinkel caliber ZW0102 CS hours, minutes, seconds | date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the 39mm Midsize 081° Blue

Selected for the 18 mm lug width · workshop selection

All 18 mm straps →

The 39mm Midsize 081° Blue, seen from the bench

The Zeitwinkel 39mm Midsize reference 081° Blue is equipped with the automatic caliber ZW0102 CS with hour, minute, second and date functions. The case measures 39mm with 18mm lugs. The Zeitwinkel manufacture movement ensures the essential timekeeping functions.

Frequently asked questions

What is the lug width of the Zeitwinkel 39mm Midsize 081° Blue?

The lug width is 18mm, the European standard for wristwatches in this dimensional category. Measure on the inner side of the lug, from one side to the other, where the strap anchors to the case. Precise measurement is essential: a 17mm strap may not fit into the lugs, whilst a 19mm strap would generate structural tension on the lugs during wear.

Which strap pairs best with the Zeitwinkel 081° Blue?

A dark brown shell cordovan or vegetable-tanned calf leather in bordeaux tone enhance the formal character of the case. Bordeaux creates a balanced triad with the blue dial and stainless steel without competing chromatically. For versatile daily wear, a grey anthracite NATO or black FKM rubber strap maintains the watch in its formal setting. A matte black alligator represents pure sophistication, with regular grain texture that does not compete with the clean design of the case.

How do you change the strap on a watch with 18mm lugs?

Use a spring bar tool specifically designed for watches. Position the watch with the lug facing upwards, insert the bifid blade of the tool into the lateral holes beneath the lug, compress slightly the internal spring pin, and remove the old strap. Insert the new strap by aligning the holes with the spring pin, and press until the fastening click. Verify that the strap is firmly seated before wearing.

Is an aftermarket strap compatible with the Zeitwinkel 39mm Midsize 081° Blue?

Yes, provided the lug width is exactly 18mm. Any strap designed for 18mm lugs—whether leather, NATO, rubber, mesh or alligator—is compatible with this model. Ensure the strap is specifically designated for 18mm lugs and not adjacent sizes such as 17mm or 19mm. milanostraps.it offers a curated selection of artisanal straps compatible with this standard.

What is the average lifespan of a leather strap on a wristwatch?

A quality leather strap, with vegetable tanning and artisanal construction, typically lasts 3–5 years under moderate daily wear. Lifespan depends on humidity exposure, body perspiration, frequency of wear and the quality of the leather itself. Exceptional shell cordovan leather may last 5–7 years. Regular maintenance—cleaning with a damp cloth, rapid drying, occasional specific creams—significantly extends strap life. Signs of natural ageing (patina, slight flexibility) do not necessarily indicate functional failure.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only