Judging by the type of document and variation of the order both were issued somewhere around early 1960s.
Formally awarded on May 17, 1945. Sacred Treasure No. 137 540 (in after war restarted numbering).
Emperor Hirohito signature.
1st class sacredtreasure awarded in 1945
1st class sacredtreasureorder
1st class sacredtreasureorder document
japanese awards and decorations
orderof the sacredtreasuresacredtreasureorderofadmiralryūnosukekusaka
vice admiralryūnosukekusaka awards
zuihō-shō
勲一等瑞宝章
瑞宝章
草鹿龍之介
草鹿龍之介海軍中将