Hi Rheta and welcome.
The Special Delivery stamp has no exceptional value, but can be considered a different "category" of stamps --> Back of Book, so named because they often appear in the back of albums and catalogues.
Look at Eric Bismarck's nice collection of Special Delivery stamps. You'll see in his notes that Special Delivery stamps have catalogue numbers beginning with the letter E
https://goscf.com/t/28254
Posted 03/20/2013 12:00 pm
