Tsuba. Please identify era and master

Tsuba please identify master and era
Thank you

tsuba identity

I have at least eleven examples of this design in my data base - unfortunately there are at least three attributions of school and no mei to narrow this down. The most common attribution is Shoami work and it is considered to be a 'classic' Shoami design, equally common is the feeling that a number of examples are Bushu and one that claims possible manufacture by the Ito school.