Strap for Master Collection 44 Retrograde Moonphase Stainless Steel / Black-Roman / Bracelet

The lug width of the Longines Master Collection L2.739.4.51.6 is 22 mm. This specific measurement corresponds to the 44 mm case diameter and must be verified by positioning a calliper between the case lugs perpendicular to the watch plane. Correct lug width is essential for selecting compatible straps that maintain proper optical proportions with the case.

The ideal strap for this model is vegetable-tanned Nile crocodile, which offers natural texture and develops a personalised patina over time. Alternatively, chromexcel calf leather provides excellent comfort with a warming caramel patina, whilst shell cordovan is an elegant option for those preferring thinner straps. Avoid synthetic or NATO straps, which would not harmonise with the technical register and robust case geometry.

Strap replacement requires removal of the spring bars (metal cylinders connecting the lugs to the strap). Use a dedicated spring bar tool or consult a qualified watchmaker. Ensure the new strap is specifically dimensioned for the 22 mm lug width. Alternatively, Casati Milano's bespoke strap service allows you to specify exact measurements directly with the atelier, guaranteeing perfect fit and quality construction.

Yes, any artisanal strap constructed with a 22 mm lug width is compatible with the L2.739.4.51.6. Always verify that the manufacturer explicitly states the lug width (22 mm) and that construction quality matches the watch's inherent nobility. Milano Straps straps are crafted from premium leather with bespoke finishing, available in numerous colour variants and materials suitable for this timepiece.

Leather strap durability depends on frequency of use, climate conditions, and material selection. A quality vegetable-tanned leather strap typically lasts 3-5 years of daily wear, developing a patina that enhances aesthetic value. Shell cordovan can last 8-10 years owing to structural density. Casati Milano's 18-month guarantee covers construction defects and provides support for maintenance and upgrades.