The style of inscriptions on cases for the Japanese orders could be useful (assuming that the set is authentic) for their dating.
The easiest way to date cases for the Rising Sun and Sacred Treasure orders is by the form of the first /top/ kanji on the case lid.
Rising Sun and Sacred Treasure...
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Formally silver kanji were introduced on December 28, 1937 by Ministry of Finance Ordinance No. 60 that prohibited the use (as wartime austerity measure) of gold in inscriptions, trademarks, etc.
Excerpt from original ordinance.
"... may no longer be produced ...
4. Gold letters, gold silk...
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