Longines Master Collection L2.665.4.51.7

The Longines Master Collection L2.665.4.51.7 takes a 21 mm watch band.

Longines · Master Collection

21mm

lug width

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Lug width: 21 mm
Case diameter: 42 mm
Reference: L2.665.4.51.7
Family: Master Collection
Case material: Acciaio
Model: Master Collection Date 42

Bands that fit

Cut and stitched in Milano, in the width this watch takes.

Hammered Pink Strap with Ecru Stitching€98

Hammered calfskin strap in cuoio€98

Hammered Calfskin Strap Light Blue€98

Millennium Green Alligator Strap€195

Matte Black Alligator Strap€195

See every 21 mm band →

Will a strap close on your wrist?

Set for this watch: 42 mm of case and 21 mm between the lugs. Add your wrist and see where a standard strap would close.

Your wrist

Watch length, lug to lug

Filled in with the case diameter, which is what we hold for this reference. Measure the watch tip to tip for the exact answer: it is usually a few mm more.

Enter your wrist measurement to see whether a standard 75/115 mm strap closes on you, and where.

Why ready-made straps come in one length →

Sizing notes

21 mm is the gap between the lugs, so a 21 mm band goes in without adapters. Whether it sits flush against a 42 mm case depends on how that case is shaped.
21 mm is an odd size: most ready-made bands are made in even widths, so this reference needs one cut to measure or a band that runs in odd sizes. Why some watches take odd sizes →
Inside the Master Collection family the lug width is not one number: it runs 13, 15, 18, 19, 20, 21, 22, 25 mm. This reference is the 21 mm one, so a band bought for another Master Collection may not fit it. Why the size changes inside a family →
21 mm is not a common size: only 2,956 of the 41,485 watches measured take it (7.1%), so ready-made choice at this width is narrower than at 20 or 22 mm. Every watch that takes 21 mm →