S&W mfg dates

[106rr]

May I ask the birthyear of my Model 57 #N616XXX. It's a 4" Blue. I bought it at a S&W trunk sale given at a gunstore.
I also have a recent Model 442 # BRN 14XX. It's a 2" nickel type finish with an, alloy frame and boot grips.
Thank You

 

[Ron James]

Model 57 = 1980
Model 442, don't know other than it was made in or after 1994

 

[106rr]

Thank you very much Ron, I appreciate your help.