Strap for Spirit Automatic 37 Blue / Strap

The lug width of the Longines Spirit L3.410.4.93.0 is 20mm. This measurement represents the distance between the two terminals of the case where the strap is inserted. It is essential to verify that any aftermarket strap has terminals precisely sized for 20mm, otherwise mechanical play and aesthetic imbalance will occur.

For the Longines Spirit L3.410.4.93.0, straps in brown or black alligator, shell cordovan, calf leather with vegetable tanning, or cotton NATO are recommended. Alligator is the most elegant solution and most coherent with the instrument's aviation heritage, whilst cordovan offers authentic patina that ages beautifully.

Changing the strap on the L3.410.4.93.0 involves removing the spring bars that hold the strap to the case lugs. Using a plastic rod or dedicated tool, gently push the spring bar from one side, lift the lug and extract the old strap. Insert the new strap in the same manner, ensuring that the terminals adhere perfectly to the 20mm lug width.

Yes, the Longines Spirit L3.410.4.93.0 accepts quality aftermarket straps, provided they respect the 20mm lug width and terminal thickness. Straps made in alligator, cordovan or vegetable-tanned calf guarantee perfect mechanical compatibility and enhance the proportions of the 37mm case.

A quality leather strap (alligator, cordovan or vegetable-tanned calf) for the L3.410.4.93.0 has an average lifespan of 3–5 years with daily use, provided it is exposed to normal humidity and moderate temperatures. Shell cordovan is the longest-lasting material, with straps capable of exceeding 7–8 years of intensive use. Storage in dry environments significantly extends useful life.