Longines · Heritage

Strap for Heritage Flagship Moonphase Stainless Steel / Silver

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width19 mm
Case diameter39 mm
ReferenceL4.815.4.78.2 (aka: L48154782)
FamilyHeritage
MovementLongines caliber L899.5 hours, minutes, small seconds | date | moonphase
Year2023
CaseStainless 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 Heritage L4.815.4.78.2 (aka: L48154782)

Selected for the 19 mm lug width

All 19 mm straps →

The Heritage L4.815.4.78.2 (aka: L48154782), seen from the bench

The Longines Heritage L4.815.4.78.2 is a 38.50mm stainless steel chronograph inspired by 1970s vintage models. It features a large-eye dial with prominent minute counter and date window, powered by the L899.5 manual-wound movement offering hours, minutes, small seconds, date, and moonphase. The 316L steel case has a 19mm lug width and displays the movement through a transparent caseback. Oscillating at 4 Hz, the caliber ensures stable timekeeping with proven reliability. This heritage piece balances classical proportions without sacrificing functional complexity.

Frequently asked questions

What is the lug width of the Longines Heritage L4.815.4.78.2?

The lug width is 19mm, measured between the inner shoulders of the lugs. Measurement should be performed with a digital calliper positioned perpendicular to the lugs, excluding the outer diameter of the lug tubes themselves.

Which strap is recommended for the Longines Heritage L4.815.4.78.2?

For this 38.50mm heritage model, we recommend alligator with medium grain in cognac brown or natural black, or vegetable-tanned calf leather to develop patina over time. Both materials respect the original vintage aesthetic whilst maintaining contemporary versatility for diverse occasions.

How do I change the strap on my Longines Heritage?

Remove the lugs from the lug tubes using a spring bar tool. Position the tool on the inner spring of the lug, apply gentle pressure, and when the spring retracts, withdraw the lug from the fixing holes. Repeat for both sides, then install the new strap by reversing the procedure.

Can I use aftermarket straps on my Longines L4.815.4.78.2?

Yes, any strap with 19mm lugs is compatible, provided the lug ends are correctly dimensioned (tolerance ±0.5mm). We recommend bespoke artisanal straps manufactured specifically for this width to ensure perfect fit and long-term durability without mechanical stress on the case.

How long does a leather strap last on this watch?

A quality leather strap with vegetable tanning and artisanal finishing lasts approximately 3-5 years with daily use and ordinary maintenance. Durability depends on ambient humidity, frequency of use, and care practices. Prolonged exposure to sunlight and water reduces longevity. Natural leather ages elegantly, developing personal character 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.

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