Hello, I am Yoshi from NILS Japanese language school.
This is the third time to learn [N1 の N2].
[N1 の N2]
When N1 is the name of the country and N2 is a product, it means that N2 is made in that country. When N1 is the name of a company and N2 is a product, it means that N2 is made by that company. In this structure, どこ is used to ask where or by whom N2 is made.
(Example)
これは　どこの　コンピューターですか。
—日本（にほん）の　コンピューターです。
—IMCの　コンピューターです。
Where is this computer made?/Who is the maker of this computer?
—It’s made in Japan.
—IMC is.
*日本（にほん／にっぽん）: Japan

[お国（くに）]
The prefix お is added to a word concerning the listener or a third person in order to express the speaker’s respect to the person. But you cannot always add お to any words to express your respect.

June 12th News, from NILS Japanese language school.