Obverse
軍民殉國是奉公 - The Military and Civilians Willingness to Make Sacrifices for the Nation [and] Rightly Serve the Public
(literally 殉国 is to die for one's country)
Japanese flag with the same slogan.
皇紀二五九八 = 1938
Marked 純銀 - pure silver.
reverse
京都タキイ種苗株式會社 - Kyoto Takii Seed Stock Co., Ltd.