Related Clues:
- Note to be used later
- Repayment reminder
- Debt acknowledgment
- Letters written by someone who's a bit shy?
- Poker pot item, perhaps
- Payment proxy
- Lendee's note
- Debt notice
- Letters often followed by a dollar amount
- Promise to pay, briefly
- Marker, of sorts
- Gambling note
- Promising letters
- Commitment to pay
- Brief promise?