This deserves a considered reply - however it's late and I can't take further pictures at this time.
Quick answer: the Nevis has a squared apron by design - this is not a flaw. I measured the width at that point across both the Dover and the Nevis and, confirming my visual impression, the boot is wider.
I'll take some close-up photos to illustrate this...
Can you comment on this post by ThinkDerm? I have a Galway on 82 last in fact the very same boot that you are selling in your classified. Galway on 82 last is marked E width. You have a Nevis on 606 last? Is it marked F or E width.
I am considering buying either Nevis or Galway on 64 last (probably both). I have been reluctant to pull the trigger so far. I wonder if Nevis or Galway 64 are indeed wide in which case I wonder if I should size down a half a size from my usual width.