Johnson V4 engine numbers

[spybot]

Can you tell what month of the year an out board was built?
How many motors were built by johnson of a certain HP each year ?
I know my was built in 1979 the last 4 digits of the id number are 3989 Is this nay clue to when it was built
Model number is 115TL79R

 

[boobie]

Call BRP Customer Service and ask them that question.