Namikawa exhibited at the 1881 National Industrial Exposition in Tokyo where his works were shown in the Art section while all other "cloisonné" works were displayed in the Industrial section. He won awards at the 1885 Amsterdam Colonial and Export Trade Exhibition, the 1885 Nuremberg International Metalwork Exhibition and the Paris Exposition Universelle of 1889. He also exhibited at the World's Columban Exposition of 1893 in Chicago. At the Louisiana Purchase Exposition of 1904 he won a Grand Prize. His work was also included in the Japan-British Exhibition held in London in 1910.