Orders of Rising Sun with ひ mark

Very rare mark. 7th class from personal collection.

Kana ひ reads exactly as ヒ

Hi




Only in hiragana it is written as ひ and in katakana as ヒ.
Derived from the kanji 比.

Are these two hallmarks related? Have they been used by the same manufacturer?
So far there is no answer to these questions.

Ribbon.

Case.

 

This is where this mark could be found on 6th class rising sun order.

 

Another example of 7th class Rising Sun order marked with ひ mark.

Silver, enamel.
Size 33.5 x 31.5 mm.