I once had a designer watch with no minute hand. (The hour hand consisted of a ball bearing that moved round the face by magnetism; though a normal hour hand would do.)
With practice I found you could estimate the time from the hour hand’s position to an accuracy of about +/- 5 minutes. So this would be ideal.
Break the minute hand off your wristwatch. Maybe some of the hour hand too.
I once had a designer watch with no minute hand. (The hour hand consisted of a ball bearing that moved round the face by magnetism; though a normal hour hand would do.)
With practice I found you could estimate the time from the hour hand’s position to an accuracy of about +/- 5 minutes. So this would be ideal.