Technical Archive

Longines
Conquest L3.430.5.98.6— lug 17mm

Longines Conquest L3.430.5.98.6: 17mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Conquest 34 Stainless Steel - Pink Gold / Purple / Bracelet

Artisanal Note

"This model requires a precise 17mm lug width to preserve the original sartorial balance."

Lug Width

17 mm

The essential strap measurement.

Browse 17mm straps →

Reference

L3.430.5.98.6

Movement

Longines caliber L888.5 Hours, Minutes, Seconds | Date | Chronometer

The Heritage

The Longines Conquest L3.430.5.98.6 is a sportive watch launched in the 1950s, featuring a 34 mm stainless steel and 18-carat rose gold case with a symmetrical design. It is powered by the automatic calibre L888.5, a chronometer-certified movement with 4 Hz oscillation frequency and 64-hour power reserve, displaying hours, minutes, seconds, and date window at 3 o'clock. The 17 mm lug width is a precise construction parameter requiring compatible straps for optimal fit and longevity.

FAQ

What is the exact lug width of the Longines Conquest L3.430.5.98.6?

The lug width of the Longines Conquest L3.430.5.98.6 is 17 millimetres. This is the distance between the two spring bars of the case. It is a non-standard measurement compared to current catalogues, requiring straps specifically manufactured for this exact width.

Which strap material is recommended for the two-tone Longines Conquest?

For a rose gold and stainless steel two-tone case, alligator leather in a dark cognac brown is the most balanced choice. Alternatively, glossy shell cordovan dialogues elegantly with the steel, whilst vegetable-tanned calf develops patina gradually over time.

How do you measure and change the strap on the Longines Conquest L3.430.5.98.6?

To change the strap, you will need a dedicated spring bar removal tool. Measure the width between the spring bars (17mm for this model) and the length from the bar to each case extremity. Gently remove the bars, extract the previous strap and insert the new one, ensuring the bars seat completely in both lugs of the case.

Is a high-quality aftermarket strap compatible with the Longines Conquest L3.430.5.98.6?

Yes, provided it is specifically manufactured for 17mm lug width and crafted by specialised artisans. A high-quality aftermarket strap—in alligator, shell cordovan or calf—offers greater personalisation than original straps, with options for colour, closure and custom finishing.

How long does a leather strap last on a Longines Conquest?

A high-quality leather strap (alligatore, shell cordovan, vegetable-tanned calf) typically lasts 5–8 years with regular daily use. Longevity depends on care, sun exposure and humidity. The patina that develops is an indicator of authenticity and correct material ageing.