Related Clues:

• Letters of note?
• Written promises
• Acknowledgement of a debt
• Some obligations
• Gambler's chits
• Paper in lieu of payment
• Promissory note acronym
• Acknowledgement of debt
• Gambler's marker
• Unofficial promissory note
• Debt voucher
• Chits
• Notes in a pot, maybe
• Letters from a debtor
• Slip in a pot