Thank you rematron. I quite understand the difficulties involved in identifying such objects, in fact most objects of historical value. I think some forum members need to understand there are some participants, like me, who have absolutely no idea about Japanese swords. Thus there has to be a starting point in the learning process, which is based on the guidance of more experienced forum members and the thirst for knowledge of the 'newbie'. I quite understand speculation, discrepancy and differing perceptions may evolve, that's normal.
I began to peruse through the internet to learn about Japanese swords and frankly, I was overwhelmed by the amount of information that is available. Having never learnt the Japanese language and being presented with Japanese technical terms, the eras, the schools and so on is challenging and it will take time.
I am intrigued by this sword, I never owned one, nor did I expect to acquire one. My military collection encompasses only a couple of Japanese items, namely a WW2 captured flag and a couple of medals, the rest is Australian and European.
I am quite happy with the sword's general history and allied information. It's a starting point.
Thank you for your input Rivkin, I will decipher your comment later today. I am still learning Japanese terminologies.