Cheers Bruce for that info .
years ago I showed the blade to a dealer / collector here in the uk but he didn’t know what the hot stamp symbolized only that it was Buddhist which I already knew , he did say the sword was very unusual and unique being a hand made , seki stamped with religious meanings attached to it .
I am very grateful for your reply and already read the post about tadahiro blade .
I will have to research further .
again sorry for the delay