1, Omega watch. 1848, Omega was born in La Sad Fonce, northwest Switzerland. Its founder Louis Brandt, whose English name is Omega, was named after the Greek letter "ω".

2. Zhongshan watch. In 1980s, Nanjing Watch Factory produced a Zhongshan watch. Its predecessor was Jiangnan Watch Factory, a public-private partnership, and later renamed Nanjing Zijinshan Watch Factory.