Bulova 1966 Prince

Hi all I would appreciate any members help in trying to identify this watch it is marked M6 on both the movement and case back the case is also marked  Bulova 10K RGP Bezel. St/Steel back. The crown is stamped with the bulova symbol . The nearest model ive found so far that looks something like this one is the Date King , but of course this one does not have the date window on it.