How many times has there been a perfect game in baseball?

How many times has there been a perfect game in baseball? There have been 23 perfect games in MLB history, with the first two coming just days apart all the way back in 1880 courtesy of Lee Richmond and John Ward.

There have been 23 perfect games in MLB history, with the first two coming just days apart all the way back in 1880 courtesy of Lee Richmond and John Ward.
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