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.
Seiko · Astron
Astron
Ref. SSH179J1
Watch details and strap advice
- Case diameter
- 42 mm
- Case height
- 12.4 mm
- Case material
- Titanium
- Case shape
- Round
- Water resistance
- 100 m
- Movement
- Quartz
- Dial
- Black
The Seiko Astron takes a 25 mm strap: measure between the lugs and that is the only number you need. With a 42 mm case and 100 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.