The black colouration on the pair of spears (with male and female anthropomorphic figures) could be the result of staining. On the other hand, the dark colouration on the spear with multiple barbs could be the result of old rust and application of used motor oil (which is a common practice among the locals) in the past.
Maurice, your idea of making the metal darker as a result of the forging process (or type of raw material) is a real possibility in my opinion. My guess is that this would likely occur post WWII.
Bill, thank you for the feedback.
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