This is a black "Jotter" model from the British planner brand, LEFAX. It's a very rare bi-fold product designed to be used within a Bible-size system planner. According to the 1988 catalog image (6th image), it seems to be used for holding refills and memos. *Please refrain from purchasing if you are sensitive to the condition of the product, as it has been stored at home. Height: 182mm Width: 222mm (when unfolded) Thickness: 7mm