I bought a used laptop about 18 months ago.
CPU: I5 7300HQ
GPU: Gtx 1060 6GB
RAM: 8GB
HDD 1000GB
Windows 10
American keyboard.
Probably not much anymore. And without a model and what you've flipped for, that won't really answer anyway…
That's all I have to say, I paid $ 600 for it.
It will be possible to find out what kind of brand it is… And most of the time these things also have a nameplate. Or. Mostly there are tools from the manufacturer that can then recognize what exactly that model is…
Maybe 300-400 euro if the battery lasts a long time and the condition is good. You can now get something similar with the latest hardware for 800 euro, so you can ask for half of it in good condition.