Ian,
The reason that I am suggesting a single craftsman is because I see the same mistake repeated on some of the knives, and I can only imagine that happening if the same hand has made the knives.
Look at the cho on your bottom knife here:
and compare it with my bottom knife here:
http://www.bladeforums.com/forums/at...postid=1610725
They are both over filed in the same way.
n2s