Can you show a picture of the top of the receiver ring?
There is the small chance it is a Norwegian K98 converted to 30-06. These were Nazi capture and converted, with a new barrel. Variations exist:
https://www.libertytreecollectors.co...?idproduct=728
http://forums.gunboards.com/showthre...-Norwegian-98K
Pics by Eastbank
https://thefiringline.com/forums/sho...d.php?t=390241
The new barrel installed by the Norwegian's is important. A proper conversion to 30-06 requires the removal of the 8mm barrel and the installation of a 30-06 barrel with a longer, thicker chamber shank. The 30-06 case is longer, hence, the reinforced area around the case needs to be longer. It is my opinion that any gunsmithing job where the "gunsmith" reams out the chamber for a longer cartridge, on a barrel chambered for a shorter cartridge, is dangerous. I believe a number of 8mm-06's were made by this method.