£200 Pc 2nd Hand?

Thinking of getting a Pc second hand and the guy says he paid £850 and got the parts separately. Specs are below, this a good deal?

Motherboard: MSI tomahawk b450 max, corsair vengeance lpx ddr4 ram 16gb Process: AMD Ryzen Graphics Card: MSI geforce gtx 1660 ventus xs 6g oc Power Unit: Seasonic focus 450 gold Hard Drice: WD BLUE 500GB SATA SSD