Ernst Collin discussed aspects of this binding on "Wednesday" in his Pressbengel, link to the English Bone Folder at left.
See also the 2005 Bonefolder Edelpappband / “Millimeter” Binding Bind-O-Rama where readers explored this structure, many for the first time.
Below are some maquettes I made to illustrate the covering stages for the version with the narrow leather edge along top and bottom (or fore-edges) and the version with invisible corners.
Below a diagram showing some of the design variants possible.
Overall images of the three books above
The Enchiridon of Epictetus, Press Intermezzo, 1997.
Edelpappband / millimeter binding: Endpapers of red Roma paper; top edge gilt; endband of pastepaper around thread core, vellum trim along top and bottom edges; covered in hand-made pastepaper; title in gold on front cover. 16.5 x 12 x 1cm. Bound 2005.
Saturday Night, 1953 / The Elements, Angorfa Press, 1998.
Other examples can be seen among the bindings here.