It seems relatively few ZC1s, if any, were issued complete with a watch. Legend has it that these watches were considered to be highly attractive items and being small and portable were soon reported as "Lost". The authorities were awake to such loses and issue of watches as standard ZC1 kit ceased and lost ones were not replaced.
That's the legend but the truth may be different. Today no one seems quite sure what watches were issued or how many. The watch holder fitted to the ZC1 radio is of a standard British design as fitted to many British radios, eg the 19 set, in pre and early War years.