Glock will tell you if you call.
Glocktalk has a serial number sticky
You will have to call Glock with the serial number.
Check with Glock Customer Service through their website.
http://www.mujglock.com/en/glock-production-date.html
Mid 80's or so.
Glocktalk.com has an extensive sn database.
Production date was 1968.
Production date 1977.
Production date was 1976.
There is a large serial number database on Glocktalk.com. Some books published on Glocks are available that also contain data.
Production date was 1977.