Thanks heaps for all the help. Just thought pop back and let you know how I went. Andrew got back to me and agreed with you all that it is signed kunitoshi but not the kunitoshi.
Andrew couldn't see any arsenal marks ao said there is a chance that it could be genuine but would need to have it in hand or possibly polish a window.
I had also contacted a markus sesko who got back to me with this.
However, it is not Rai Kunitoshi in his earlyer Nijimei phase but a WWII smith with that name, most likely the work of the Kunitoshi whose real name was Mori Kunimatsu. He was from Gifu and was born in 1914. There were three more smiths active at that time who signed with Kunitoshi - Nigara Hiroshi, Fujimura Matsutaro, and Enju Kunitoshi - but their signature style differs from your blade and therefore I think it we are facing a work of Mori Kunimatsu alias Kunitoshi.
Best regards,
Markus
I have a new found love of Japanese swords now, I had no idea the complexity behind them. I take my hat off to all who study this acient art and now complete understand how addictive it can get.
I have 2 other Japanese swords I might look into now, much newer ones.
Also like to say thanks to bazza for the info and amazing offer.
Kirsty