Tutorial 6 min read
Omega Speedmaster watch strap guide
One black dial, four different directions. Explore suede, nylon, rubber and woven straps, starting with the 20 mm lugs of a specific Moonwatch reference.
Casio · G-Shock GA-100
GA-100-1A2
Ref. GA1001A2
Watch details and strap advice
- Case diameter
- 55 mm
- Case height
- 16.9 mm
- Case material
- Resin / Plastic
- Case shape
- Round
- Water resistance
- 200 m
- Caliber
- 5081
- Dial
- Black
The Casio GA-100-1A2 Black Blue takes a 29 mm strap: measure between the lugs and that is the only number you need. Built for water, it wears naturally on rubber or a nylon NATO; a leather strap keeps it for dry days. With a 55 mm case and 200 m of water resistance, a thicker strap balances the case. Most straps here come with quick-release spring bars, so the swap takes a minute and no tool.
Read before you choose
All stories
Tutorial 3 min read
Choosing a NATO strap or a two-piece strap
Learn how NATO and two-piece straps attach to your watch, affect wrist height, and provide security so you can choose the right style.
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.