This rare scarf is based on an engraving from the book “Compleat Angler” by Isaak Walton.
The 4 corners of the engraving feature a portrait of the author of this famous book on fishing.
The square features 13 oval paintings, each representing a species of British freshwater fish, with its name and fishing season. Next to each picture, a floating label gives details of when and where to find the fish, and what bait to use.
Translated with DeepL.com (free version)
Added the information plus a link to the wikipedia page of the book.