No serial number - no answer.
1973
The Smith & Wesson Model 27-2 was produced from 1961 until approximately 1982. The specific manufacture date can usually be determined by the serial number, with the first Model 27-2 being introduced in 1961. If you have a specific serial number, it can help pinpoint the exact year of manufacture.
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
1979-80
no serial number = no way to answer.
call S&W factory and ask date of manufacture at: 1-800-331-0852