Related Clues:

• Item sold in rolls of 100
• Passport mark
• Snail mail need, often
• Philatelist's buy
• First day cover feature
• Thing canceled at a post office
• ... sons stop press
• Item in a book, roll or pane
• It's rare Fred Mercury loses the head with Old Bob fronting the Band Aid
• Frank put foot down
• With 48-Down, philatelist's collection
• An email or text doesn't need one
• It's on a mailed letter
• Postage necessity
• Collectible in an album