Zeitwinkel · 42,5mm Classic

Strap for 273° Blue

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter43 mm
Reference273° Blue
Family42,5mm Classic
MovementZeitwinkel caliber ZW0103 hours, minutes, small seconds | big date | power reserve indicator
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 42,5mm Classic 273° Blue

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The 42,5mm Classic 273° Blue, seen from the bench

The Zeitwinkel 42.5mm Classic 273° Blue features a 42.5mm stainless steel satin case and a deep blue dial. Powered by the Zeitwinkel caliber ZW0103 movement with big date complication, power reserve indicator, and off-center small seconds, this model embodies Bauhaus minimalism. The 20mm lug width ensures precise compatibility with straps designed for this case diameter and construction.

Frequently asked questions

What is the exact lug width of the Zeitwinkel 42.5mm Classic 273° Blue?

The lug width of the Zeitwinkel 42.5mm Classic 273° Blue is 20mm. This dimension represents the distance between the spring bar axes and corresponds to the standard width that a strap must possess to fit into the lugs without forcing or excessive play.

Which strap is the best choice for the Zeitwinkel 42.5mm Classic 273° Blue?

Strap selection depends on context and personal aesthetic preference. For formal wear, vegetable-tanned calf leather in black or cognac brown offers uncompromised elegance. For everyday versatility, crocodile leather in dark tones presents a considered texture. For sporty practicality, woven cotton NATO or FKM rubber respect the minimalist grammar of the case.

How do you change the strap on the Zeitwinkel 42.5mm Classic 273° Blue?

Strap replacement is accomplished by removing the spring bars using a dedicated spring bar tool. Position the tool in the lug slot, gently push to release the spring bar, extract the old strap, and insert the new one whilst properly aligning with the lugs. Ensure the spring bar is fully seated and the locking pin is secure.

Can I use a generic aftermarket 20mm strap on this watch?

Yes, any strap with a 20mm lug width is theoretically compatible. However, we recommend artisanal straps of elevated construction quality to respect Zeitwinkel's design intent. The precision of the lug holes, structural rigidity, and material quality directly influence wearing experience and aesthetic compatibility.

How long does a leather strap last on the Zeitwinkel 42.5mm Classic 273° Blue?

Leather strap durability depends on use intensity and material quality. A vegetable-tanned calf strap, worn daily, maintains structural integrity for 3–5 years. Crocodile leather with vegetable tanning, owing to fibre density, may last 5–7 years. Proper maintenance—occasional cleaning, appropriate drying—extends longevity. Upon reaching end-of-life, the strap can be replaced without case intervention.

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