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Glashütte Original · Senator

Strap for Senator Cosmopolite Stainless Steel / Blue / Alligator / Folding

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

21mm
21 mm strapsAll Glashütte Original
Lug width21 mm
Case diameter44 mm
Reference1-89-02-05-02-30
FamilySenator
MovementGlashütte Original caliber 89-02 hours, minutes, small seconds, world time, day / Night Indication, Additional 12 hours Hand (adjustable) | big date, day | power reserve indicator
Year2020
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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Straps for the Senator 1-89-02-05-02-30

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Senator 1-89-02-05-02-30, seen from the bench

The Senator World Time houses the manufacture caliber 89-02 with world time, big date, day and power reserve indicator functions. The movement includes an adjustable second hour hand and day/night indication for the selected time zone. The lugs measure 21mm in width.

Frequently asked questions

What is the exact lug width of the Glashütte Original Senator 1-89-02-05-02-30?

The lug width of the Glashütte Original Senator 1-89-02-05-02-30 is 21 millimetres. This dimension corresponds to the internal width of the case lugs and represents the critical parameter for strap compatibility. Measured precisely from the inner edges of the lugs: 21 mm exactly.

Which strap is best suited for the Glashütte Original Senator 1-89-02-05-02-30?

For the steel Senator, the ideal strap depends on application: alligator in black for formality and timeless aesthetics (minimal patina development), vegetable-tanned calf for casual elegance with natural patina maturation over time, NATO in polyamide for versatility and practical sports use. The optimal technical choice for highlighting the Saxon watchmaking tradition is alligator, which creates subtle contrast with the brushed steel case finish without competing visually with quadrant complexity.

How do I change the strap on my Glashütte Original Senator 1-89-02-05-02-30?

The strap is replaced using a spring bar tool (the lever specifically designed for lug springs). Locate the small holes or slots at the sides of the lugs, insert the tool tip into one and gently lift the spring to slide the strap out of the lug. Repeat on the opposite side. To install the new strap, align it with the lugs and press each spring back into place until locked. An operation requiring only minutes and no specialist knowledge.

Are aftermarket straps compatible with the Senator 1-89-02-05-02-30?

Yes, any strap with a 21 mm lug width is fully compatible with the Senator 1-89-02-05-02-30. Artisanal quality straps (leather, NATO, rubber) from specialist suppliers such as Milano Straps often offer superior durability and aesthetics compared to OEM options. Compatibility is guaranteed by conformance to the lug width standard: 21 mm.

What is the average lifespan of a leather strap on my Senator?

A quality leather strap (alligator or vegetable-tanned calf) on a Senator worn regularly (5–7 days per week) has an average lifespan of 3–5 years before requiring replacement due to wear or micro-tears. Rotating between multiple straps (at least 2–3 alternatives) significantly extends the life of each by reducing concentrated wear. Synthetic materials (NATO, rubber) offer superior longevity (5–10 years) due to reduced sensitivity to humidity and thermal fluctuations.

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