Hey Fellas,
So after doing some research it seems that the first generation Kaneyasu was left handed and signed in a mirror image.
"Mutsu no kami Kaneyasu was among the last generations of the Tegai school of Yamato, who migrated to Osaka around the end of the 16th century. Among his pupils was the renowned Iga no kami Kanemichi, whose own pupils included Echigo no kami Kanesada. Kaneyasu is known as Hidari Mutsu from his custom of signing in mirror imagery."
I have found a few examples of the signature to compare against. I will also see about taking some better photos once I am able.
Thoughts on this??