A past question from NO QUARTZ, the free daily watch quiz. The answer is highlighted below.

Question 2·Multiple choice

What does a watch's 'power reserve' tell you?

  • A.How long the battery lasts before replacement
  • B.How deep it can safely go underwater
  • C.How long it runs on a full wind before stoppingCorrect answer
  • D.How many seconds a day it gains or loses

The story behind it

Power reserve is the time a fully wound mainspring can keep the watch going before it needs winding again. A dial gauge that shows how much is left is itself counted as a complication, since it does more than tell the time.

From NO QUARTZ Ref. NQ0007, the puzzle for Sept 29, 2026.

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