Movement: NOMOS caliber (stainless steel with date indication ring)
Diameter: 19 mm (inside)
Height: 10 mm
Power reserve: forever (as long as the sun shines)
Characteristics: can be worn either on your finger or with a leather string around your neck
This is how it works:
1. Position the sundial so the sun shines
2. Set the correct date in the middle
ring on the hole.
3. Let the sundial hang freely from the
thread, with the hole towards the sun.
4. A ray of sun on the inside of the ring
shows the correct time.