This is an uncommon, attractive cover(quite clean, but w/ a few stains here and there, and some wear and tear around its edges; The back flap is intact, but does have a small tear in it.) sent by what was very likely an ethnic German then living in Osaka, Japan, to a Major Nojiri, Essen/Ruhr, Germany, on December 24, 1910! The mail went to Germany via Siberia. The sender was most likely a German military advisor to the Imperial Japanese Army, and was sending a greeting card for Xmas and New Year's at the printed matter rate of 2-Sen(in fine condition!)! Major Nojiri was likely an observer or military attache imbedded with the Imperial German Army at that time! Or, he could have been touring a Krupps' iron/arms factory in Essen. Noted imperfections aside, this cover looks to be a nifty example of correspondence between officers of the Imperial German Army and Imperial Japanese Army. It should come as no surprise that some Germans felt betrayed by the Japanese when they later sided with the Allies in WW1, and attacked Tsingtao, and other German colonies in the Pacific!