My thanks to you too Bruce.
Thought I'd put up the auction house text.
"A Second World War Japanese NCO's Shin Gunto Katana, the 67.5cm machine made steel blade with a narrow fuller to each side, numbered 50123, with brass habaki and tsuba, the fuchi stamped with Kokura arsenal markings, with brown painted aluminium tsuka and spring clip, the green painted steel scabbard numbered 50123 at the mouth, 97cm"
Auction is on 6th December.