Hello, Masako:
Thank you for your good Japanese stamps. Lastely I am looking for stamps of your country. If you want, we can make an exchange. I am a serious collector (I have been collecting since 40 years ago). I can send you used Spanish stamps and mint Spanish Andorra (Spanish Andorra years 1970-1985). I have some mint of Spain (years 1970-1990).
If you want we can exchange 50 x 50 or 100 x 100. Please, always good stamps, not broken, damaged, etc. Thank you.
I will wait your answer.
Greetings from Tenerife:
Fernando
