Technical Archive

Breguet
Classique 5177BA/12/9V6— lug 18mm

Breguet Classique 5177BA/12/9V6: 18mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Classique 5177 Yellow Gold / Silver

Artisanal Note

"This model requires a precise 18mm lug width to preserve the original sartorial balance."

Technical Specifications

Breguet 5177BA/12/9V6
Lug Width
18 mm

The essential strap measurement.

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Reference

5177BA/12/9V6

Movement

Breguet caliber 777Q Hours, Minutes, Seconds | Date

The Heritage

The Breguet Classique 5177BA/12/9V6 is a 38 mm yellow gold case watch with an argenté guilloché dial featuring hand-applied Breguet details including pomme hands and Arabic numerals. It houses the Breguet 777Q automatic movement offering hours, minutes, seconds, and date with approximately 45 hours of power reserve. The 18 mm lug width is standard across the Classique line to maintain harmonious proportions.

FAQ

What is the lug width of the Breguet Classique 5177BA/12/9V6?

The Breguet Classique 5177BA/12/9V6 is fitted with an 18 mm lug width. This measurement is standard across the entire 38 mm Classique line and determines the width of compatible straps. To verify, measure the internal distance between the two lugs of the case with a caliper.

What is the best strap for the Breguet Classique 5177BA/12/9V6 in yellow gold?

The polished Mississippiensis alligator strap in bordeaux, chocolate, or Havana black tones is the most aesthetically coherent choice for the 18-carat yellow gold case and guilloché dial. Alternatively, box-calf leather in midnight blue or forest green offers a slightly more contemporary feel while maintaining the necessary formality of the Classique.

How do you change the strap on the Breguet Classique 5177BA/12/9V6?

The strap is replaced using an 18 mm springbar and a dedicated pointed tool (springbar tool). Insert the point into the lug housing, compress the pin, and remove the strap. This operation requires care to avoid scratching the yellow gold. If you lack experience, it is advisable to consult a watchmaker or the Casati Milano atelier.

Are there aftermarket straps compatible with the Breguet Classique 5177BA/12/9V6?

Yes. Any 18 mm strap with a standard springbar is technically compatible with the Breguet Classique 5177BA/12/9V6. Milano Straps offers a selection of 18 mm straps in leather, alligator, and other materials, handcrafted and sized to fit perfectly with the Classique lugs.

How long does a leather strap last on a Breguet Classique 5177BA/12/9V6?

A high-quality alligator or calf leather strap, with alternating use and proper maintenance—avoid prolonged contact with water and sweat, occasionally apply neutral conditioner—has an average lifespan of 2 to 4 years. Casati Milano straps are covered by 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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The atelier's website: casatimilano.com