These cases could easily be detected by atypically styled upper kanji 勲 - Merit.
Comparison with a "typical" inscription for "early" (1888-late 1930s) cases (on the example of 6th class cases).
Comparison with "typical" inscription for "late" (late 1930s- 2003) cases.
Currently known time period for cases with such "atypical" inscriptions late 1930s-early 1950s.
Comparison with a "typical" inscription for "early" (1888-late 1930s) cases (on the example of 6th class cases).
Comparison with "typical" inscription for "late" (late 1930s- 2003) cases.
Currently known time period for cases with such "atypical" inscriptions late 1930s-early 1950s.