Ignition Timing Question

On stock engines, an early 71 model uses a single point distributor, beyond that year they use dual point. According to the engine plaque the single point is timed at 6 degrees BTDC, beyond that 16 degrees. Is the difference solely because of single vs. dual point? Emissions?

Oh, then I saw this while searching. Says 10! What gives?

Image result for detomaso pantera engine plaque 

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