What a mystery you set us Bryce. I laughed when I saw your heading. QEII wearing an anklet!! The heading brightened an otherwise dreary day!
After I looked at the images I immediately wondered if what looks like an anklet was in reality a fold in HM's stocking: such things were the bane of many a lady's life.
Then I looked more closely at the
Tatler image, and noticed that the photo has been damaged by a tear or creasing.
The
Town and Country magazine has used a photo from Getty which does not have any damage.
Nevertheless, I checked in the newspapers of the time. None shows the dark band near HM's ankle.
Sphere Detail from above
Daily Mirror