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To determine what year a Brother sewing machine is you use the letter and first number, which indicate the month and last number of the year. Brother sewing machines have coded serial numbers. The serial number B25139839 could have been made any year ending with the number 2 such as 1982. The owner manual would have a year. There are currently no serial numbers that start with a B.

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Q: What year is brother sewing machine serial number B25139839?
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