Well if it is an original by Winchester anniversary model, it is worth more than $750.00. But if it is a Japanese Moroco, then I would not pay more than $700.00 but that is just me. If you think about it, a NIB Marlin 95 will run you almost $600 and that is after Remington bought them.
So an original Winchester is not going to be cheap any more. I have a couple of winnie's that are pre 64 that will will bring 700 or more used and one is almost 100 years old!