Toyo Toki Kokura Japan
The logo OCW refers to Oriental Ceramic Works, a precursor to Toto, known for its washlet toilets and Toyotoki Kaisha. Toyo Toki Kaisha was an affiliate of the Morimura bros is now known as Noritake.
See: http://morimura.co.jp/english/history/ , under 1917.
See: https://jp.toto.com/en/company/profile/outline/history/index.htm