1973
No serial number provided.
Glocktalk.com can assist you.
Subtract the first two digits of the serial number from 100 and that will be the year of manufacture for this rifle. 100 - 27 = 73 "1973"
No Model 27 has that serial number.
1978
1980
1980
no serial number = no way to answer.
1979-80
call S&W factory and ask date of manufacture at: 1-800-331-0852
@ 1988