Ian,
Thanks.  It relieves me no end to know that those far more astute than I are also uncertain! 
 
The clue about the drilled through "hanger" tie is a new one to me. Very helpful.  
When it arrives, I will post more pictures in this thread of the major features.
"But hey, what's in a name really?"
 
 
Good point.  And since when do we expect the categories to be nice and tidy?  Obviously someone had a need for a knife like this and someone had an idea about what to make and now we have this odd "not bangkung", which is what I might start calling it.
- Dave