Possible Clues:

• Surcharge on a photograph
• Additional matter applied to a finished postage stamp
• Type of stamp which may be produced in wartime, or when a currency changes
• Add to what's on page in report to be rewritten, inserting verse
• Stamp with added text
• Run off too many, though by definition a superior picture
• Postage stamp with added lettering
• Put too many stamps on letters
• Postage stamp with superimposed text