Typical breast star of this type.
Case.
Rosette.
This type of construction was introduced by Japanese Mint in the late 1970s (somewhere around 1979) together with two-letter marks https://asiamedals.info/threads/two...it-marks-on-japanese-orders-and-medals.13720/
Before 1979 breast star vs. after 1979 breast star
All known breast stars of Sacred Treasure order (and Rising Sun order https://asiamedals.info/threads/trident-breast-stars-of-the-order-of-rising-sun.24347/) of such construction bears such marks.
Trident breast stars were in use until 2003 when new type of breast star fastening was introduced.
Type 2003
Case.
Rosette.
This type of construction was introduced by Japanese Mint in the late 1970s (somewhere around 1979) together with two-letter marks https://asiamedals.info/threads/two...it-marks-on-japanese-orders-and-medals.13720/
Before 1979 breast star vs. after 1979 breast star
All known breast stars of Sacred Treasure order (and Rising Sun order https://asiamedals.info/threads/trident-breast-stars-of-the-order-of-rising-sun.24347/) of such construction bears such marks.
Trident breast stars were in use until 2003 when new type of breast star fastening was introduced.
Type 2003