I just bought a 1958 delux model (walnut checkered stock) in good to VG condition. I paid $500.
By 1968 these rifles were being made by CZ, usually with Brno components - or so I've been told. If you have the Brno receiver with the 16 mm dovetail. Than I will say $400 to $700. If you have the CZ receiver than 4 to 500. Rimfire Central has a good thread on all the changes to the Brno's.