I have had GW-M5600 for years. It has all you need from a watch and nothing more. It's almost perfect watch.

1. It's small and looks like G-shock classic and has typical C-shock features.

2. Solar powered.

3. Multi-band 5 timekeeping from atomic clocks in the US, EU or Japan. I set the time once after I bought it and just switch daylight savings time twice a year.

The only issue is that it needs integrated strap specific to the model, not generic one. Casio straps for G-shocks break in everyday use in every 5-6 years. Durable stainless steel strap costs $100, roughly the same as the watch itself.