Post Office : Syowa Antarctic Research Station Post Office [Not used now]
First day of use : --. --, 1979 (Showa 54)
Last day of use : --. --, 1991 (Heisei 3)
Postmark date : Dec. 18, 1989 (Heisei 1)


Reference: Encyclopedia of Japanese Scenic Cancellations 1931-2017 Vol.1

Post Office : Shirase Ship Post Office [Not used now]
First day of use : -
Last day of use : -
Postmark date : Dec. 18, 1989 (Heisei 1)