Just checked my collection of watches & they range from 0.27 /Usv/hr for a Russian DeepSea Divers Watch to 0.14 /Usv/hr for a black Seiko (SR71) watch.
The Radiation levels are:
0.01 - 0.1 Normal Background
0.1 - 1.0 Medium Level
Greater than 5 High Level
Greater than 50 Very High Level - LEAVE AREA!!