How Many Mao Badges Are There Out There?

Who knows how many Mao badges were produced since Mao Zedong (毛泽东) was revered as Emperor-God?

In her book Mao Memorabilia The Man and the Myth, Lynn Pan estimated that 4.8 billion badges were churned out.

She added: "Based on the amount of aluminium it takes to build one MiG-21, no fewer than 39,600 planes could have been produced with the metal the badges consumed."

Hmm.