Mechanics 3 min read
The simple science of quartz watches
Learn how a battery, a tiny crystal and a simple circuit work together to keep your quartz watch running with highly reliable accuracy every day.
G-Shock · Classic Style
Jelly-G
Ref. GMAS140M1A
Watch details and strap advice
- Case diameter
- 45.9 mm
- Case height
- 15.8 mm
- Case material
- Resin / Plastic
- Case shape
- Round
- Water resistance
- 200 m
- Movement
- Quartz
- Dial
- Black
The G-Shock Jelly-G takes a 25 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 45.9 mm case and 200 m of water resistance, a thicker strap balances the case. Quartz movement. 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 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.
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.