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April 2012. The 347th Eagle II made.
Here's how to decipher Deering serial numbers:
First, you eliminate the final four characters, which merely duplicate the neck code. It's a way of confirming that the neck and resonator of a banjo left the factory together. With that out of the way: The two digits before the neck code are the year (12 = 2012), the first two digits are the month (04 = April), and the numbers in between the month and year are this banjo's production number for its model (0347 = 347th Eagle II).
Some other Deering serial number trivia: Your banjo is old enough all four characters in the neck code are numbers. Not too long after your banjo was made, they started using a letter for the fourth character from the end. Vastly increases the number of unique 4-character codes available for necks. Also in way back, Deering used to put a dash between the first part of the serial neck code. Helped separate it. That's no longer needed with the neck code starting with a letter. So why your serial lacks the dash, I'll never know.
I learned how to decode Deering serial numbers from their website. Guess I could have pointed you there.
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