TAG Heuer · Monaco

Strap for Monaco Boutique

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

Lug width20 mm
Case diameter39 mm
ReferenceCAW218D.BC6663
FamilyMonaco
MovementTAG Heuer caliber 11 hours, minutes, small seconds | date | Chronograph
Year2023
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 Monaco CAW218D.BC6663

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Monaco CAW218D.BC6663, seen from the bench

The Monaco was introduced by TAG Heuer in 1969 as the world's first self-winding chronograph with a waterproof square case. It features the automatic Calibre 11 with hours, minutes, small seconds, date, and chronograph functions. The distinctive square case shape sets it apart from traditional round chronographs.

Frequently asked questions

What is the lug width of the TAG Heuer Monaco CAW218D.BC6663?

The lug width of the TAG Heuer Monaco CAW218D.BC6663 is 20 millimetres. This measurement is determined by the linear distance between the fixed lugs of the case. Since the Monaco features integrated, non-modular lugs, it is critical to ensure the strap is exactly 20mm: a 1mm deviation would result in instability or mounting failure.

What is the best strap for the TAG Heuer Monaco CAW218D.BC6663?

The optimal strap depends on intended use: cognac-coloured alligator is the classical choice that complements the dark titanium and creates a retro-seventies harmony. Black vegetable-tanned calf offers formal sobriety and enhanced artisanal character. For sports practicality, a grey-taupe NATO provides durability without aesthetic conflict. All options are available in 20mm at milanostraps.it.

How do I change the strap on the TAG Heuer Monaco CAW218D.BC6663?

Strap replacement requires a specialised tool (spring-bar removal). Position the watch on a stable surface and use a pin remover to gently push the spring-bar from the opposite side until it releases. Extract the old strap, align the new strap with the lug holes, then reinsert the spring-bar until it locks. We recommend consulting a watchmaker to avoid damaging the integrated lugs.

Is an aftermarket strap compatible with the TAG Heuer Monaco CAW218D.BC6663?

Yes, provided it is certified for 20mm lug width. Quality aftermarket straps—such as those in alligator, calf, or NATO from milanostraps.it—are fully compatible and do not compromise warranty when installed correctly. Always verify the exact measurement before purchase, given the rigidity of the integrated lugs.

How long does a leather strap last on the TAG Heuer Monaco CAW218D.BC6663?

A quality leather strap (alligator, vegetable-tanned calf) will last 2–4 years with moderate wear, extending to 5–6 years with rotation between multiple straps. Longevity depends on sun exposure, humidity, perspiration, and frequency of use. Leather straps require occasional maintenance (soft cleaning, conditioning) to slow ageing. Milanostraps.it straps include an 18-month warranty against manufacturing defects.

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