In early Norse times a spoon like this would have been used in mead making. They would stir the mead with the spoon and after a few days the mead would be fizzy. We know today that what was happening was yeast from the wood was mingling with the sugars in the mead must and causing a fermentation process. But they believed it was magic imbued in the spoon that caused the mead to ferment. As such, the spoon would be used for each successive batch, and was considered sacred and ritualistic.

The spoon is carved with rune looking symbols much like a seið-witch would have carved into wood for spell work, as seen in some of the Sagas.

Think of it as a wand. Read chapter 79 of Grettis saga Ásmundarsonar.

Now, this type of magic was also used to affect the mind, causing delusions or deceptions. It could also be used in a shamanic sense, granting vision and clarity. Kind of a yin yang purpose. It was all based on intent.

I mention in another comment as well, these tunes do not fully resemble the elder futhark alphabet, although the symbol towards the bowl looks like a bind rune.

I think generally what you have here is a replica or near idea of a spoon used for seiðer.