Identify tea service?

[dkbrown]

I have inherited a porcelain tea service and would like to know more about it.  I'd be most grateful if anyone could assist.

I attach photos of the service and the mark on the base of each item.

[Stan]

This is Japanese porcelain, I would think 2nd half of the 20th century, I am not sure what the mark is, maybe someone else can help with the mark.