The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Wikipedia[2] gives September 1972 for the US release and no exact day, so the date sits on the last day of that month.
Wikipedia confirms the Odyssey as the first commercial home video game console released by Magnavox in the United States in 1972, matching the console discussed in the documentary's video-gamers segment.
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