Related Clues:

• Show impatience, in a way
• Notary's need
• Visa marking
• Sender's need
• Album feature
• Opposite of tiptoe
• Re-inkable item
• Tread heavily
• Thirty-nine-center
• Make impressions
• Philately specimen
• OK, in a way
• Visa feature
• Penny Black was the first one
• Post office purchase