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.
1stclasssacredtreasureawardedin19451stclasssacredtreasure order
1stclasssacredtreasure order document
japanese awards and decorations
order of the sacredtreasuresacredtreasure order of admiral ryūnosuke kusaka
vice admiral ryūnosuke kusaka 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