hello
i am a seller too. some time. china customs or china post office man they take watch also. but most of time the watch check by oversea contry customs. and i also advice send by normal register air mail to few country. especially Europe...... but register air mail is very slow and easy lose.
but better then your watch check by customes.
i still remember few week ago. i send few watchs to my buyer. then customs check his watch. he send a lawyer letter to customs. because i declare as gift. and my buyer ask me write a e-mail to him. let me tell customs that watch is gift. finally customs return those watch to him.
but until now. i have very less watch check by customs. i have my own way to send watch out without any problem. i send normal register mail to UK. only one week,