Kongsberg Våpenfabrikk used German Mauser 98k actions for the manufacture of the M59.
The picture shows a civilian M59.

Closeup of the action and re-profiled bolt handle:
Old markings were removed, and the front receiver bridge was opened to accommodate loading of the somewhat longer (compared to the 7.92×57 mm Mauser) .30-06 cardridge,
This is also found on the M59 rifles which were re-chambered to the 7.62×51mm NATO cartridge.
On the civilian version, only the extractor claw was blued, while the rest of the bolt was polished, while on the army issue M59F1, the whole bolt was blued.

The pistol grip:
The magazine follower on the 98k would lock the bolt's forward motion on an empty magazine.
This feature was retained on the M59:
The half-length cleaning rod was screwed into the fore-end.
Two to three of these were required to assemble a rod of sufficient length:
A civilian M59 (top) in .30-06 and the army issue M59F1 in 7.62×51mm NATO (bottom, with a side-mounted scope).
Note the blued bolt and absence of the cut-out in the front receiver bridge on the M59F1.
Note also the different markings on the front receiver bridge.
Kongsberg Våpenfabrikk used German Mauser 98k actions for the manufacture of the M59. The picture shows a civilian M59.
Closeup of the action and re-profiled bolt handle:
Old markings were removed, and the front receiver bridge was opened to accommodate loading of the somewhat longer (compared to the 7.92×57 mm Mauser) .30-06 cardridge,
This is also found on the M59 rifles which were re-chambered to the 7.62×51mm NATO cartridge. On the civilian version, only the extractor claw was blued, while the rest of the bolt was polished, while on the army issue M59F1, the whole bolt was blued.
The pistol grip:
The magazine follower on the 98k would lock the bolt's forward motion on an empty magazine. This feature was retained on the M59:
The half-length cleaning rod was screwed into the fore-end. Two to three of these were required to assemble a rod of sufficient length:
A civilian M59 (top) in .30-06 and the army issue M59F1 in 7.62×51mm NATO (bottom, with a side-mounted scope). Note the blued bolt and absence of the cut-out in the front receiver bridge on the M59F1. Note also the different markings on the front receiver bridge.
Mauser M59