Assuming that the group is 100% authentic, this is the latest coordinate for the M mark on the actually issued Japanese order https://asiamedals.info/threads/mark-m-on-japanese-orders-and-medals-who-and-when.14818/
Certificate No. 1 765 103 issued on June 30, 1945 /only two months left...
3rdclasssacredtreasureorder3rdclasssacredtreasureorderawarded for ww2
3rdclasssacredtreasureorderawardedin19453rdclasssacredtreasureorder marked m
japanese order of the sacredtreasureorder of the sacredtreasureorder of the sacredtreasure award certificate
order of the sacredtreasure award document
sacredtreasureorder marked m
zuihō-shō
勲三等瑞宝章
瑞宝章