MX3KP 1947 Manchuria

MX prefix was used by Manchoukuo.
Manchoukuo was a state created in 1932 by the Japanese in Manchuria, a puppet regime ruled in name only by "The Last Emperor" PuYI. It only existed till 1945 (end of the war). Manchoukuo shows up in the country list of pre WWII as MX, (in the Radio Handbook of 1939), but it of course disappears after 1945. See the other MX cards in the Gallery.

QSL Collection at Doku Funk, Austria
Courtesy of OE1WHC