Related Clues:

• It's stuck in the corner
• Bit of philately
• Impression
• Imprint
• Philatelist's find
• Philatelist's prize
• Passport endorsement
• Approval sign
• Sign of approval
• Notary's tool
• Impress
• Postage
• Album entry, perhaps
• Envelope item
• If it's canceled, it has been accepted