Zenith · Revival

Strap for Defy A3648 Revival Shadow

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

Lug width18 mm
Case diameter37 mm
Reference97.A3648.670/21.M3648
FamilyRevival
MovementZenith caliber Elite 670 hours, minutes, seconds | date
Year2025
CaseTitanium

Spring bar

Swiss Standard universal spring bars

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

Straps for the Revival 97.A3648.670/21.M3648

Selected for the 18 mm lug width · workshop selection

All 18 mm straps →

The Revival 97.A3648.670/21.M3648, seen from the bench

The Zenith Revival 97.A3648.670/21.M3648 is a 37mm titanium sports watch from Le Locle featuring the internal Calibre Elite 670 movement with chronometer escapement and 36,000 vph oscillation. It offers hours, minutes, seconds, and date window functionality. The model features an 18mm lug width, a technical specification that determines strap compatibility and visual proportions on the wrist.

Frequently asked questions

What is the lug width of the Zenith Revival 97.A3648.670/21.M3648?

The Zenith Revival 97.A3648.670/21.M3648 features a lug width of 18mm. This measurement represents the physical space between the lugs of the case through which the strap must pass. It is a critical technical specification ensuring proper strap compatibility and visual stability once mounted.

Which strap is best suited for the Zenith Revival 97.A3648.670/21.M3648?

For the titanium Revival, we recommend shell cordovan in dark brown or alligator in black with pronounced grain texture. These noble materials create superior aesthetic dialogue with the titanium case. Shell cordovan develops a patina over time reflecting the conscious aging of the metal, whilst alligator emphasises titanium through textural contrast.

How do you change the strap on this Zenith model?

The Zenith Revival 97.A3648.670/21.M3648 employs standard straight lugs measuring 18mm. For strap replacement, remove the spring bars connecting the strap to the lugs. Using a spring bar tool or extraction device, apply controlled pressure to free the bars, then extract the worn strap and insert a new one of identical lug width.

Does the Zenith Revival 97.A3648.670/21.M3648 accept compatible aftermarket straps?

Yes, the model accommodates quality aftermarket straps provided they respect the 18mm lug width specification. Milano Straps offers a range of artisanal 18mm leather straps manufactured to standards ensuring durability and comfort. Compatibility is guaranteed by conformity to standard lug width.

What is the average lifespan of a leather strap on this watch?

A noble leather strap (shell cordovan, alligator, calf) mounted on a Zenith Revival typically lasts 3-5 years with moderate daily use. Variables including wearing frequency, sun exposure, humidity and maintenance significantly influence longevity. Vegetable-tanned straps tend to develop aesthetic patina before requiring replacement, transforming wear into conscious visual narrative.

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