Strap for Spirit Automatic 37 Champagne / Strap

The lug width of the Longines Spirit L3.410.4.63.2 is 20mm. This measurement represents the internal distance between the lugs of the case and is essential for selecting a compatible strap. You can verify it by measuring directly between the lugs with a digital calliper or by observing the width of the original metal bracelet.

Louisiana alligator or vegetable-tanned calf leather are the ideal choices for this model. Alligator delivers natural elegance and ages magnificently, whilst vegetable-tanned calf offers discretion and authentic patina development. For those preferring an informal aesthetic, a heavyweight NATO canvas strap is perfectly compatible and roots the watch in its aviational heritage.

The strap is replaced by removing the lug pins (also called spring bars). Use a dedicated spring bar removal tool, available from any watchmaker: position the watch on a stable surface, extract the pin from one lug whilst holding the bracelet steady, repeat on the other side. Install the new 20mm strap in the same manner, ensuring the pins are fully seated.

A quality handcrafted leather strap in vegetable-tanned or alligator leather maintains structural integrity for 4 to 6 years with daily wear, provided appropriate care is taken: avoid prolonged water immersion, dry if wet, and occasionally apply a neutral conditioner. Surface patina may intensify further over time, but once the leather begins to crumble in flex zones, the strap must be replaced to prevent case damage.

Yes, the Longines Spirit L3.410.4.63.2 is fully compatible with quality aftermarket straps, provided they respect the 20mm lug width specification. Our handcrafted straps in alligator, calf, shell cordovan and FKM have been tested for flawless installation on this Swiss reference, without gaps between lug and strap.