The dating system in Chinese characters for these coins goes: "Five Ten Five" (55) and "Three ten three" (33). Read them Left to Right for these contemporary Japanese coins, but earlier coins were read Right to Left. Chinese Characters can be read Left to Right, Right to Left or Top to Bottom. I don't think that they can be read Bottom to Top. Never encountered that before.
I always go to en.numista.com and use the advanced search tool. You can use Chinese / Japanese / Arabic, etc. letters as a search, and it helps a lot!