Strap for Master Collection 41 Retrograde Moonphase Stainless Steel / Black-Roman / Bracelet

The Longines Master Collection L2.738.4.51.6 features a lug width of 20mm. This measurement is the fundamental parameter for selecting compatible straps. You can verify it by measuring the distance between the two metal pins at the case extremities using a calliper or millimetre ruler.

For the Master Collection L2.738.4.51.6, we recommend straps in Brilliant alligator or vegetable-tanned calf leather, thickness 1.6-1.8mm. Both materials engage elegantly with the brushed steel case, maintaining the dress-oriented identity of the model. For sportier use, a canvas NATO or fluoroelastomer rubber strap ensures durability.

Strap replacement involves removing the spring bars (pins) using a dedicated tool: position the small extractor beneath the pin, lift slightly to compress the internal spring, extract the pin from the case. Repeat for the other side, then remove the old strap. Install the new strap by inserting the pins into the lugs. If unfamiliar with the procedure, entrust the task to an experienced watchmaker to avoid case damage.

Yes, any strap with a 20mm lug width is compatible with the Master Collection L2.738.4.51.6. Verify that the strap thickness does not exceed 3mm in the area passing beneath the case, otherwise it may obstruct winding and crown adjustment functions. milanostraps products are tested for this compatibility.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) lasts an average of 3-5 years with daily wear, extendable to 7-10 years with regular maintenance: limited sun exposure, monthly cleaning with damp cloth, annual treatment with colourless wax. Determining factors include environmental humidity, frequency of use and personal care. Premium milanostraps straps with 18-month warranty ensure above-average longevity.