Technical Archive

Longines
Conquest 3.430.4.90.9— lug 17mm

Longines Conquest 3.430.4.90.9: 17mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

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

3.430.4.90.9

Movement

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

The Heritage

The Longines Conquest 34 mm, reference 3.430.4.90.9, features a 34 mm stainless steel case with a compact, classic design. Powered by the Longines L888.5 automatic movement with COSC chronometer certification, it offers hours, minutes, seconds, date window, and anti-magnetic silicon hairspring. The lug width is 17 mm. Water resistance is rated at 30 meters, reflecting purposeful everyday use rather than sport performance claims.

FAQ

What is the correct lug width for the Longines Conquest 3.430.4.90.9?

The lug width of the Longines Conquest 3.430.4.90.9 is 17 mm. This dimension, measured between the spring bars of the case, is essential for selecting compatible straps. Proper measurement requires a digital calliper positioned perpendicularly to the lugs, measuring from the centre of one to the centre of the other, to ensure accuracy.

Which strap material is recommended for the Conquest 34 mm?

For the Conquest 34 mm, noble materials are recommended: alligator (ventralis or hornback), vegetable-tanned calf leather, or shell cordovan. Black polished alligator creates dramatic contrast with the brushed steel case; cognac calf offers generous ageing and natural patina development; shell cordovan provides intrinsic lustre that dialogues with the metallic case material.

How should I change the strap on the Longines Conquest 3.430.4.90.9 without damaging the case?

To change the strap safely, use a dedicated spring bar removal tool or consult a specialist watchmaker. Place the watch on a stable support, identify the correct extraction direction of the spring bars, and apply uniform, gentle pressure. Avoid improvised tools or hammers to preserve the brushed steel case finishing.

Is a third-party aftermarket strap compatible with the Conquest 3.430.4.90.9?

Yes, provided the lug width is precisely 17 mm and the spring bar diameter matches the Longines case standard. Always verify technical specifications before purchase. milanostraps.it offers verified 17mm straps, customisable and tested for compatibility with the Conquest model.

What is the expected lifespan of a leather strap for a watch like the Conquest?

A premium leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3–5 years with daily use, provided regular maintenance: avoid prolonged moisture exposure, protect from direct sunlight, and replace when fibres begin to fray. milanostraps straps include an 18-month warranty.