The double spiral is a universal bronze age, f.i. Dong-Son, motif.
In this case my guesses are either Timor/Moluccan (if originally matched in Borneo), or maybe Batak (maybe added later in Holland)?
It's quite common to add foreign artefacts for protection as imported "magic" seems quite often to be considered stronger than domestic.
Mjolnir and Viking motifs seems a bit far-fetched to me...
Michael
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