The design is listed in Pick as the 1946 series, P# 85 in my old 1986 edition. Banknotes.com page. The note's were cheap back in 1986, 75¢ in Unc. They were only issued for two years from 1946 until the introduction of the brass 1 yen coin in 1948.
As for the duplicate serial numbers, there are two explanations I can think of. First, they could be fakes. Second, it could be a printing error, where a numeral failed to click over.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
I wonder if these note are actually errors. If you need to see if they're real, find a current Japanese note and compare the paper. The paper quality should be the same (both from mulberry bark.)
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