Sounds like the scabbards been with the kukri for a long time Tim,
Usualy the majority of these kukris have Kothimara Silver fittings to scabbard or quill work instead.
Heres one of mine Of the early long handled crescent design that yours evolved from.
The silver fret work is breathtaking I think.
Just a shame its not Rhino or gold to go with it!
The scabbard with yours looks like the ones that usuly look like this.{they come with variation in curve & waiste of course, many more like yours.}
{photos copied off ebay years ago I think? if it breaches anyones copywright or wishes please contact & I will remove it immediatly.}
Your second from top photo shows the amount the width differance between kukri & scabbard. And the bolster clearly doesnt match the fit at top of scabbard, with a top quality kukri like yours the original would.
But they do compliment each other & look very good.
I am sure the kukri & handle look familar, but I cant recall where, maybe photos of an old collection or something.
Spiral