Omega
Constellation 1312.30.00— lug 18mm

The lug width of the 1312.30.00 is 18 mm. This is the distance between the two case lugs where the strap attaches. You can verify it by positioning a digital caliper horizontally between the bases of the two lugs: the value must correspond exactly to 18 mm to ensure a perfect fit.

Alligator remains the most refined choice, enhancing the two-tone gold-steel case. Red-brown shell cordovan is excellent for those seeking natural patina over time. Cream or cognac calf leather offers daily versatility. For sporty contexts, bi-material rubber or NATO straps guarantee practicality without aesthetic compromise.

Remove the watch from your wrist and place it on a soft cushion. With a spring bar tool (double-ended instrument), insert the thin tip into the lateral slot of the lug, gently lifting the internal spring. When the spring opens, extract the retaining bar. Repeat on the other side. For installing the new strap, reverse the process, ensuring the spring closes completely around the lug.

Yes, any strap with an 18 mm lug width is compatible, provided the thickness does not exceed 3.5 mm to maintain the visual harmony of the case. Choose quality-certified straps with nylon or silk stitching, finishes in polished or satin steel, and retaining lugs in corrosion-resistant steel to preserve your investments over time.

A quality leather strap – alligator, shell cordovan, or vegetable-tanned calf – typically lasts 3-5 years with daily use, depending on exposure to moisture, sweat, and sunlight. Materials with vegetable tanning age more slowly but develop a fascinating patina. Bi-material rubber and NATO straps have superior durability (5-7 years). Regular maintenance with specific balms significantly extends the strap's lifespan.