A little help?

Hello, I am new to this site and could use a little help identifying some coins from Asia. I have attached a couple pictures. Any assistance would be appreciated.

coin a is a 1 sen  https://en.numista.com/catalogue/pieces5670.html

coin C is 1/2 sen  https://en.numista.com/catalogue/pieces15169.html

Quote: ken6528coin a is a 1 sen  https://en.numista.com/catalogue/pieces5670.html

How can I tell the year it was struck?

Use the dates from these coins and match it to your coin dates.

https://en.numista.com/catalogue/pieces983.html

A is the 17th year of Meiji
C is the 15th year of Meiji

The Chinese coins does not have dates on them.

Here is "B". I found it and added it to the catalog.  https://en.numista.com/catalogue/pieces22675.html

Quote: rdunkleeHow can I tell the year it was struck?

https://en.numista.com/numisdoc/calendar-japanese-34.html

 ... if the coin is from Japan. Though I think the Chinese use the same characters, just different emperors. Does there need to be a Chinese calendar converter also in Numisdoc ?

P.S. I remembered a topic from a while ago where date/calendar converters were mentioned, and there is a Chinese one on the site in the topic ...  https://en.numista.com/forum/topic1698.html

Sorry, I did not see that no one answered the Chinese coins.
B is Chien-Lung Tung-Pao
D is Tao-Kuang Tung-Pao
E is Ch'ia-Ch'ing Tung-Pao