Related Clues:
- Philatelist's concern
- The Beatles' 'Revolver' or 'Help!'
- Piece of postage
- Inverted Jenny is a rare one
- PAID, for one
- Holder of photographs
- Glass rectangle
- Characteristic mark
- Unit of glass
- It's usually stuck in a corner
- Snail-mail need
- Wedding memento
- Book that holds photos
- Book for photographs
- Licked square