In general the design details are much simpler, I'm not good at judging chronology but it strikes me as an early-to-mid era Dana pack.
The bottle pockets are small and appear to be neoprene-y.
Classic Dana lumbar pad and hypalon grip-panel on the back side, and a thinly padded waist belt.
What strikes me as the most interesting design feature is how the waist belt is attached to the far side of the pack and routed through a webbing slot to keep it pointed towards the wearer. My theory is this behaves as the compression mechanism and removes the need for the separate stabilizer straps that so many lumbar packs sport.
The search is on for more specimens!