Mechanics 8 min read
How an automatic watch works
Your wrist gives it energy. A spring saves it. A tiny balance sets the rhythm. Follow the journey inside an automatic watch, one pencil drawing at a time.
Zenith · Defy
Defy A3648 Revival Shadow
Ref. 97A3648670/21M3648
Watch details and strap advice
- Case diameter
- 37 mm
- Case material
- Titanium
- Case shape
- Round
- Water resistance
- 600 m
- Movement
- Automatic
- Caliber
- Elite
- Dial
- Black
The Zenith Defy A3648 Revival Shadow takes a 18 mm strap: measure between the lugs and that is the only number you need. We list 31 straps in that width. Built for water, it wears naturally on rubber or a nylon NATO; a leather strap keeps it for dry days. With a 37 mm case and 600 m of water resistance, a strap of medium thickness keeps the balance. Automatic movement. Most straps here come with quick-release spring bars, so the swap takes a minute and no tool.
Straps by lug width (18 mm) 31
All 31 18 mm strapsWidth is a starting point. Check the case and end fittings before choosing.
-
Slim Colour LeatherLeather€24.90 -
Rivet RallyLeather€49.90 -
Dense Mesh SteelSteel€34.90 -
Diagonal WeaveNylon€24.90 -
Ladder Link SteelSteel€39.90 -
Square Slot SiliconeSilicone€22.90 -
Vintage RallyLeather€34.90 -
Denim StitchNylon€22.90 -
Aviator BundLeather€39.90 -
Eyelet CanvasNylon€22.90 -
Smooth SiliconeSilicone€19.90 -
Parachute ElasticNylon€22.90
Read before you choose
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Tutorial 6 min read
How to change a watch strap
Identify the attachment, release the correct part and check that both tips are seated. Illustrated instructions for quick-release bars, conventional bars and nylon pass-through straps.
Tutorial 6 min read
Breitling Galactic watch strap guide
Compare leather, suede, rubber and textile straps for the Breitling Galactic 36, with verified 18 mm sizing for A37330121G1X1 and direct links to the catalogue.