You are correct with the year and sum of money which was to pay off a debt.Mr Delboe on 16 Feb 1659, although in those days, the year began on 25 March (I didn't know that either!), so it is really 16 Feb 1660. The amount was £400 (=£76,000 today). Source: https://moneyweek.com/426390/16-february-1659-the-first-british-cheque-is-issued.