Longines Admiral L3.666.4.56.3
The Longines Admiral L3.666.4.56.3 takes a 21 mm watch band.

Longines · Admiral
- Lug width
- 21 mm
- Case diameter
- 42 mm
- Reference
- L3.666.4.56.3
- Family
- Admiral
- Case material
- Acciaio
- Model
- Admiral Chronograph Black Brown Strap
Bands that fit
Cut and stitched in Milano, in the width this watch takes.
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.
mm
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.
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 Admiral family the lug width is not one number: it runs 20, 21, 22 mm. This reference is the 21 mm one, so a band bought for another Admiral 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 →
Other Admiral references
- Admiral Chronograph Black StrapL3.666.4.56.2
21 mm - Admiral Chronograph BlackL3.666.4.56.6
21 mm - Admiral Chronograph Brown StrapL3.666.4.66.2
21 mm - Admiral Chronograph BrownL3.666.4.66.6
21 mm - Admiral Chronograph Silver StrapL3.666.4.76.2
21 mm - Admiral Chronograph Silver Brown StrapL3.666.4.76.3
21 mm
Same lug width, other Longines lines
- Master L2-920-4-92-6L2-920-4-92-6
21 mm - Avigation Chronograph Stainelss Steel / Silver / BraceletL2.622.4.71.1
21 mm - Master Collection Chronograph 40 Stainless Steel / Blue / StrapL2.629.4.92.0
21 mm - Master Collection Date 42L2.665.4.51.5
21 mm - Master Collection Date 42L2.665.4.51.6
21 mm - Master Collection Date 42L2.665.4.51.7
21 mm
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