Sorry to correct you, but your statement is wrong. According to the official Swiss statistics, only Asia as a whole, including the strong Middle East, Japan, Korea, Singapore, Taiwan, Thailand, etc.) accounts for 52% of the export value. (Jan.-May 2015)
China without Hong Kong is responsible for 6.7 % of the export value, including Hong Kong it is 23%. The USA as a buyer of Swiss watches is considerably stronger than China (without Hong Kong), and Italy only a bit weaker than China.
However, a small-production brand can - and has to - concentrate on a narrow market profile. However, this can lead into doom, as several examples show (Daniel Roth, Gerald Genta).
Marcus