The design and brand name of this leather notebook pen holder by Quiver on a Moleskine. : r/moleskine
PU Leather Pen Holder Clip Adhesive Pencil Elastic Loop for Book Notebook | eBay
Quiver Pen Holders for Moleskine Notebooks Review - The Gadgeteer
Adjustable Elastic Band Pen Holder, Pencil Holder, Pen Sleeve Pouch for Hardcover Journals, Notebooks, Planners, Fits Notebooks from 8" to 11” in Height, Hold 2 or 3 Pens, PU Leather, Detachable. :