I think you'll find a few threads using Puuko in the search engine; and yes there are a few enthusiasts around this place .
Lovely knife .
I had one similar in size with a fid in a attached pocket .
I got it 45 years ago at a ship chandlery in Copenhagen; not quite a Puuko style handle or sheath, but close . The blade was the finest stainless I have ever encountered .
Some bastard stole it from me .