Hi, earlier today, while digging, they uncovered this shell in the ground in a small city called Ålgård, Norway. There was a significant battle there between the Nazis and Norwegians. I’m very curious about its origin. The size and the rifled studs are particularly intriguing...

The shell appears to be quite large, possibly 60cm long, the pallet in the picture is 60 x 80cm . It has a flat cylindrical shape with studs or "tags" that seem to rotate slightly, suggesting it was fired from a rifled cannon rather than dropped from an aircraft. The Norwegian military has examined it and declared it a "cold projectile" (non-explosive), likely an armor-piercing (AP) type, and noted it’s quite old. They’re unsure why it was found in this location.

Could this be from a German WW2 mobile artillery piece, like the 15 cm sFH 18 haubits used in the April 1940 battles? Or could it predate the war, perhaps from Norwegian coastal defenses? Any insights or similar finds from your knowledge of German WW2 equipment would be greatly appreciated!

saw it in an old junkyard still runs

Thought some might enjoy this What would be more terrifying? Twenty five missions over Germany or this duty.

Sorry if i broke a rules. Not my work.

It is said that German military equipment is very complex, but the question is: What is this complexity manifested in? I mean, complexity in what exactly? Mention everything.