Early to mid 70s Gerry leather bottom backpack. Two compartments, stacked in the so-called “tear drop” fashion. Sturdy strap construction with thick padded shoulder straps and large D ring /leather top attachment. This model could be considered transitional from the earlier era of felt padded and leather straps. Front lashing with original nylon strap for holding poles or axes. Waist strap features the innovative Gerry two-pronged buckle.
Basecamp Vintage & Archives 
I own this model. Purchased 1974. Still in good condition. It, and I, went many places together – Colorado, Utah, Arizona, Montana, Canadian Rockies. Great little hiking/mountaineering pack.