As title suggests, I’m curious on the history and if it was common practice for civilian owned patriotic Hinomaru flags to be signed by a single person. The flag I have in question measures 10x13”. The Kanji writes out to 柄實子 or 楠實子. I believe “實” was old font that predates 1945 (correct me if I’m wrong), from the help of translators it likely spells out the female name Emiko Nakamura. 子 meaning a child, and 柄 meaning a pattern. Harvest pattern or Fruitfulness pattern?

Your thoughts on the kanji make sense.

 

However, for people born before WWII, the official spelling of their name may be in old kanji.

 

So, with the information we have now, I don't think we can deny the possibility that it was used in rallies or sporting events after WW2.

 

Furthermore, "仲村 柄實子=Emiko Nakamura" is a common Japanese name and there are no particular clues to be gained from it.