Windows on Canterbury: A Bookmark

Here’s a bookmark found in a batch of used books at Crux:

Canterbury bookmarkdescription of window

It is pretty. And sort of upside down. This bookmark has the tassel dangling from the bottom instead of hanging off the top. I’m not sure how that is meant to work. Maybe the bookmark is meant for a small book so the tassel hangs below the book to mark the page? Maybe it is meant for a prayerbook. Maybe it actually me that is upside down.