Strap for Avigation Watch Type A-7 1935 41 Bronze / Blue / The Hour Glass

The lug width of the Longines Heritage L2.825.1.93.2 is exactly 21mm. This measurement is specific to this reference and ensures correct visual proportions relative to the 41mm case diameter. To verify the lug width, measure the internal distance between the two case lugs where the strap attaches, excluding the external geometry of the terminal.

For the Longines Heritage L2.825.1.93.2, straps in vegetable-tanned alligator (tobacco or cognac), black shell cordovan, Hermès calf leather, or NATO in nylon/gabardine are recommended. Vegetable-tanned alligator amplifies the natural bronze of the case; black (alligator or cordovan) offers formal sobriety; NATO returns the chronograph to its historical aviation vocation. Avoid synthetic straps or saturated colours that contradict the material authenticity.

To change the strap on the Longines Heritage L2.825.1.93.2, you must remove the spring bars (lug pins) from the case seats. Use a dedicated tool (strap remover) positioned beneath the spring bar, applying gentle pressure until the mechanism clicks out. Once the old strap is free, align the new strap's lugs to the 21mm width and insert the spring bars into the case seats, verifying correct attachment.

Yes, 21mm aftermarket straps are compatible with the Longines Heritage L2.825.1.93.2. However, the rarity of this lug width requires specialist research: many manufacturers offer standard 18mm, 20mm or 22mm sizes, but not 21mm. MilanoStraps offers 21mm personalised straps online ready for dispatch, and the Casati Milano atelier creates bespoke straps with direct leather selection and 18-month warranty.

A quality leather strap (alligator, cordovan, calf) on the Longines Heritage L2.825.1.93.2 lasts an average of 3-5 years with daily wear, extendable to 7+ years with regular maintenance (monthly cleaning, annual treatment with specific creams, drying after moisture exposure). Vegetable tanning ages better than chrome tanning, developing attractive patina. Rubber and NATO offer superior longevity (5-10 years) but less aesthetic character.