Asking Price ???

[Gill the Piano]

A lot depends on how it is structurally - no point having a pretty box if there's nothing inside that works! Another factor is where you live - prices vary enormously round the country.
Ask your tuner what s/he reckons - someone who will know the piano and how tuneable it is, whether it's at concert pitch or not, whether it has an iron frame...there are all sorts of variables which affect its price as an instrument.
If you're just selling it as a pretty box, then they go for about two hundredish around the Chilterns. You need to find a rich Londoner who wants to furnish a country cottage or something!