Which mythological item's brand positioning was NOT correctly established through a divine crafting process to enhance its perceived value?

Throughout history, mythology and folklore have featured divine objects and artifacts that held special positions in their respective pantheons. These legendary items were essentially the 'brands' of the ancient world, with distinct positioning and attributes that made them instantly recognizable. Test your knowledge of how these mythological products were positioned in their cultural narratives!

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Mjölnir (Thor's hammer) - crafted by dwarven brothers Brokkr and Sindri as part of a wager
Excalibur - forged by the Lady of the Lake using enchanted metals from Avalon
Aegis (Zeus's shield) - created by Hephaestus with the hide of the goat Amalthea
Gungnir (Odin's spear) - fashioned by the dwarves known as the Sons of Ivaldi from cosmic materials