This relatively uncommon, business(?) cover(w/ very long letter; very clean, an intact back flap, but the envelope has been a bit shortened, and has a jagged top connected to the original, rough opening of the envelope) was sent from Tainan, Taiwan(then occupied by the Japanese), to Fukuoka Prefecture, Japan, on September 1, 1920! The green, 2-Sen, and orange, 1-Sen, Japanese definitives are in pretty good condition. The CDS from the Tainan P.O. is complete, but rather light/faded. Noted imperfections aside, this remains a nifty piece of Taiwanese and Japanese postal history!