Sweden issued this block of four WWF stamps in a booklet pane format on Oct. 1, 1994. The mint stamps feature the following birds from Sweden: Sterna caspia, Haliaeetus albicilla, Dendrocopos leucotos, and Anser erythropus. The retail value of this item is $9.00 (Scott 2008 Standard Postage Stamp Catalogue, Vol. 6).

The above image is an enlargement (scanned at 125% of actual size); the actual size of this block of stamps is 78 x 80 mm.

Scott Catalogue No. 2097 - 2100.