They would have had holidays and weekends off. There also might have been problems with machines or shortages that would have shut the line down, strikes, plant closings due to low sales, second or third shifts, production speed-ups due to improved processes, etc.
Just use your numbers to estimate the date of manufacture and then move it forward if necessary to the next day that you are sure was a working day. That"s the best you will be able to do without access to the serial number logs (which may no longer exist).
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