70' model Gibson es335 walnut bought new perfect condition with hard case what's it worth ?

It's worth quite a bit but unfortunately it may be one of the Gibsons produced the ';Norlin years'; which would decrease its value somewhat. You need to contact a high-end vintage guitar dealer like Mandolin Brothers or Elderly Instruments. They will give you an estimate over the phone and for a fee will give you an appraisal for insurance purposes. They will also sell it on consignment for you if you so wish.