Technical Archive

Longines
Conquest L3.430.4.02.9— lug 17mm

Longines Conquest L3.430.4.02.9: 17mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Conquest 34 Stainless Steel / Mint Green / Rubber

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

L3.430.4.02.9

Movement

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

The Heritage

The Longines Conquest L3.430.4.02.9 is a 34mm stainless steel watch from the Conquest line, originally established in 1954 as a certified chronometer instrument. It features the Longines caliber L888.5 automatic movement with hours, minutes, seconds, date window, and COSC chronometer certification. The case diameter of 34mm represents a deliberate choice balancing elegance with wrist presence, while the 17mm lug width is a precise specification requiring exact measurement for strap compatibility. The sapphire crystal and stainless steel construction ensure durability and readability.

FAQ

What is the exact lug width of the Longines Conquest L3.430.4.02.9?

The lug width of the L3.430.4.02.9 is 17mm. This measurement should be verified with a digital calliper, measuring from the inner edge of one spring bar tube to the other. A measurement error causes friction and damages the strap over time.

Which strap material pairs best with the 34mm Conquest in stainless steel?

Black or deep brown alligator leather is the formal choice, enhancing the compact diameter without weighing down the wrist. Vegetable-tanned calf leather suits those desiring natural patina development. Cotton or silk NATO straps offer casual versatility. Natural rubber is recommended for high-humidity environments or intensive daily wear.

How do I correctly change the strap on a Longines Conquest L3.430.4.02.9?

Position the watch face-down on a soft surface. Locate the spring bar tubes (metal shafts connecting the lugs). Use a spring bar tool to compress the internal spring and slide the tube horizontally from its seat. Repeat on the opposite lug. Insert the new strap, aligning the spring bar tube with the seat, and release the spring. Verify symmetrical seating.

Can I fit an 18mm aftermarket strap on a 17mm Conquest?

No. An 18mm strap will not fit: the lug is only 17mm wide. Forcing it risks stress damage to both the lug and buckle. The sole exception is a width-adjustable strap (rare and expensive). Always verify compatibility before purchase.

How long does a leather strap last on a daily-wear watch?

A quality artisanal alligator or calf strap lasts 18–36 months with daily wear and proper care (periodic cleaning, drying, avoiding prolonged moisture). Vegetable-tanned leather typically outlasts chrome-tanned variants because the fibres retain elasticity. Shell cordovan, if available, exceeds 4 years. Lifespan varies with climate and frequency of wear.