M63-3 date help

[snuf]

I think my M63-3 (BBZ47xx) was shipped around 1989 or 1990.
Am I close with that guess

 

[toroflow1]

Book says 1989.

 

[Jase2007]

My 63 is day 145 of 89 is bdy serial prefix so id say 88-89 if i had to guess

 

[snuf]

Thanks for the info