Whether this was considered a perfect game or not, I don't know. But If it had been, it was corrected long before 10 years ago. When I listened to Larsen's World Series Perfecto back in '56, it was called baseball's first perfect game.....ever.
No, Larsen’s was the first WORLD SERIES perfect game.....There were two in 1880, and 3 more in the “modern era” before Larsen’s....