This uncommon, attractive, double-rated cover(w/ a LONG letter!) was sent from Keijo(present-day Seoul; one great strike of the, "Keijo," CDS!), Korea(then occupied by the Japanese), to Okayama Prefecture, Japan, on January 8, 1927!  Considering the date it was sent, it likely had some kind of New Year's greeting inside for the relatives it was addressed to. 

To continue, the two, red, 3-Sen Japanese definitives are in fine condition! Six sen had to be paid due to the weight of the letter(s)!

Lastly, as for the envelope made of Japanese, WASHI, paper, it is in pretty good condition. It's pretty clean! It's been reduced some at the top due to having been opened there. Noted imperfections aside, this remains a nifty piece of Korean and Japanese postal history!