Hi,
this is not Sütterlin. Sütterlin was developed 1911, introduced into the Prussian school system from 1915 on and forbidden to be taught and used in official correspondence in 1941.
What we have here is a predecessor, the so called German current. This is a bit harder to decipher. It is always a good idea to scan /present a larger amount of text so one can compare the letters and study it closer.
From what I can make out so far:
Einen aufrechtigen ac[c]ort oder Verglich gemacht. Den 24. Tag October 1799.
accort means nett, freundlich, umgänglich (pleasant, agreeable) seems to be used as noun here in the sense of amicable deal? For me it looks like something relating to a contract.
Best,
GreyC