Thanks Bruce! So I learnt the other day my Dad as a 5yo boy (now 77yo) use to take it out and swing at the wooden railing outside his house with all of his might 😱. It was too heavy for him to hold so he'd lay it on the floor to slide out the blade. It's treated with much more respect these days.
Also, sorry for the double up of info on all the different platforms I have posted this to. It appears everyone helping is connected here, on fb and/or reddit and I haven't realised I was speaking to the same handful of people!
Sorry for the delay in replying! Here's some more photos. So far, it was narrowed down to Morita or Murayama, but now possibly thinking it's neither.
Very appreciative of everyone's hard work looking into this for me too
https://m.imgur.com/a/NyvQwCt