Stamps for collectors are available through online auctions and through dealers. You can also order them directly from the Japanese government online.
No, you have to use stamps from the country of origin of the mail. In this case you will have to use Italian postage stamps.
That is what stamps are for, to pay postage. In the US you buy postage stamps and put them on mail to any other country in the world.
US postage stamps do not expire -- they are always worth face value as postage.
Not in the United States. The US Postal Service approves the postage stamps.
No. When mailing items you use the stamps of the country of origin.
The US issued the first postage stamps in 1847.
No, you must use US postage stamps.
No - Us stamps can only used on mail sent from the US.
ofcourse they do
First class domestic postage is 42 cents. You can buy stamps in other denominations.
20 in a book, 100 in a roll (assuming you are not talking about a collectors book of stamps).
No.