These bookmarks are made from vintage cards published by Frederick Warner & Co as part of their popular Observer's series. Each card has an illustration one side and information text on the other.
Repurposed into a useful bookmark with the addition of a ribbon they make an unusual bookmark and can be used either way up if you prefer the card or ribbon to extend from the book.
The card measures approximately 6.5 x 11.5 cm and has a ribbon around 11-12cm long.