Related Clues:

• Sender's need
• Album feature
• Re-inkable item
• Thirty-nine-center
• Philately specimen
• OK, in a way
• Visa feature
• Penny Black was the first one
• Post office purchase
• Some vegans won't lick it
• Abolish (with ''out'')
• Collectible that displays its original value
• Ink spot
• Pouting person's action
• Notary's item