Why does this finely made khyber knife have an incomplete fuller?
 

This is a khyber knife made for a wealthy client, great effort was made to ensure it looks aesthetically pleasing, however why is the fuller incomplete? Surely a smith who put so much detail in other areas could afford to make the fuller meet and not be split in two, especially if this was made for a wealthy client.

Even lesser khybers have a complete fuller. Perhaps this was negligence on the smiths part?

I'd guess overpolishing in that specific area for some reason? Perhaps there was a forging flaw on both sides that had to be removed. There honestly, typically, isn't much value you can expect to glean from idiosyncrasies in antiques. 9/10 times the answer to "why does this (idiosyncrasy) exist?" is "it just does"; it's hard to say much more since we can't personally ask the artisans responsible for producing the item.

Again though, I'd imagine it has something to do with excessive polishing/grinding in that particular spot.

Agree complete with your comment Nihl! Another reason could be grinded/polished away corrosion! ;)

It is curious the ground away area is next to the gold - does the blade show a declivity at that location, or just at the fuller?