The Pioneer Watch:
For the first time worldwide a watch shows the time by moving
steelballs - in a mechanical way! - OTIUM Sphaera
OTIUM Sphaera Ø XL 38 mm - white|silver balls OTIUM Sphaera Ø XXL 42 mm - black|silver balls
Look for the slit in which the ball is in the extreme outside position.
Then go clockwise one slit further and you get the hour.
You can read the minute as usual by the little sweeping hand.
also available in XL also available in XXL
black|silver balls white|silver balls
white|black balls white|black balls