Makers mark on Japanese Red Cross medal

[Ynsman 0]

I recently noticed the attached maker's mark on a Red Cross medal, on the reverse of the suspension. Does anyone know which company this might represent?

[JapanX 11]

This is 

井 / i /

Unidentified as per today.

Edited June 29 by JapanX

[Ynsman 0]

Thank you for that

Alan