Longines · Master Collection

Strap for Master Collection 38.5 Stainless Steel / Yellow Gold / Silver-Arabic / Bracelet

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
ReferenceL2.755.5.78.7 (aka: L27555787)
FamilyMaster Collection
MovementLongines caliber L636 Hours, Minutes, Seconds | Date, Day
CaseYellow Gold, Stainless 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 Master Collection L2.755.5.78.7 (aka: L27555787)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Master Collection L2.755.5.78.7 (aka: L27555787), seen from the bench

The Longines Master Collection L2.755.5.78.7 is a 38.50 mm case combining yellow gold and stainless steel with a brushed silver dial. Powered by the automatic Longines caliber L636 movement, it displays hours, minutes, seconds, date and day. The 20 mm lug width accommodates compatible straps in leather, technical fabrics or rubber.

Frequently asked questions

What is the lug width of the Longines Master Collection L2.755.5.78.7?

The lug width of the Longines Master Collection L2.755.5.78.7 is 20 mm. This measurement refers to the distance between the two lug pins and determines strap compatibility. A 20 mm strap fits perfectly into the metal axes of the case, ensuring correct tension and stability. Precise measurement between the pins is essential to avoid ordering errors.

What is the best strap for the Longines Master Collection L2.755.5.78.7?

The best strap depends on usage and personal preferences. For formal occasions, a mahogany or black alligator amplifies the luxury of the yellow gold and stainless steel bicolour case. Burgundy shell cordovan represents an intermediate choice, with noble ageing characteristics over time. Grey smoke calf offers versatility from day to evening. For a more sporty approach, a NATO canvas strap in navy blue or anthracite grey leverages the case's material duality without sacrificing elegance.

How do I change the strap on the Longines Master Collection L2.755.5.78.7?

Strap change is accomplished via spring bars that pass through the lug pins. Using a spring bar remover or pointed tool, gently press the spring towards the centre until the pin is released from one side. The strap will disengage. To install a new strap, align the holes with the pins and press until you feel the click of engagement. It is advisable to work on a soft surface to avoid damage. If inexperienced, entrust the task to a professional change service.

Can I use aftermarket-compatible straps with the Longines Master Collection L2.755.5.78.7?

Yes, the Longines Master Collection L2.755.5.78.7 with 20 mm lugs is fully compatible with aftermarket straps of the same width. Milanostraps.it supplies artisanal straps in alligator, shell cordovan, calf and other materials, customizable in size, initials and stitch colour. The Atelier Casati Milano also creates bespoke custom straps with direct consultation on leather selection and 18-month warranty. Aftermarket straps often offer superior quality and customization impossible with OEM straps.

How long does a leather strap last on the Longines Master Collection L2.755.5.78.7?

Durability depends on material and usage. Quality alligator with vegetable tanning lasts 5-8 years in daily wear, developing a noble patina over time. Shell cordovan, more resistant, can last 8-12 years thanks to the muscular structure of horse leather. Calf, more delicate, has a longevity of 3-5 years with regular use. Factors influencing durability include wear frequency, moisture exposure, maintenance and tanning quality. An artisanal strap with vegetable tanning, such as those by Casati Milano, ages nobly rather than degrading, extending perceived value over time.

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.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only