Slight Thread drift.......
My watch is an old Rolex Explorer 2 - not been serviced for at least a decade - runs fast a minute per day! -- but you should see my household clocks:
Most accurate - a Caesium Beam frequency standard - 1 part in 10-13
Next - GPS-controlled oscillator - 1 part in 10-11
then - 2 off Rubidium Secondary standards - 1 part in 10-10
plus - Radiocode clock - 1 part in 10-10
followed by several Pendulum master clocks - 1 part in 10-5(ish)
You could say that I have a slight interest in time measurement!
(and I keep forgetting to reset my Rolex, so it is usually about 5 minutes fast - but that is good enough for most activities!)