It's worthless According to the information of 7788 Collection Network, Japanese Gan Mao is an appliance in the period of the Republic of China, which belongs to daily necessities and exists in large quantities, so its collection value is not high and worthless. Gan Mao, a time-honored brand that existed during the reign of Emperor Kangxi, was deeply loved by Japanese. A large number of Gan Mao products are Japanese tribute to time-honored brands, while Gan Mao's pure tin products are polished by hand.