In KP Vol. 50 Nr. 4 (November 2005) Florian Eichhorn wrote a short article about a mysterious cancellation. This is shown here again, with some new information and a remarkable new 2018 addition.
Collects Japan, Korea Kingdom/Empire (covers/postmarks only) and ROK (covers only), China postmarks to 1949 and Dutch East Indies covers/postmarks as sideline.