need help on pricing a wang 600

so on a pick up today I came across an old wang 600 series programmable calculator and its not in the best shape for a huge payday but everything for the most part is there and just does not work which I do not know enough about older series to tinker with it with out ruining it. so I wanted so advice for those out there knowing what is what to go about a good fair price on it for parts I do realize its a smaller market and people are not spending a lot as they were but I was thinking at least $400 would be a good starting price since working ones I have seen go for 3-5k in a good day