Date stamp on the barrel, check here for diagram/information.
http://remingtonsociety.com/rsa/questions/barrelcodes
Impossible to answer without the sn or date codes.
Your rifle was manufactured around 1974 or 1975. For a more accurate date look on the left side of the barrel for tw letters. The second one indicates the year, a y is for 1974 and a z is for 1975.
The manufacture date of western field model M782 with the serial 830424 is 2012.
The manufacture date was march of 1923.
If you provide the serial number in your question then I can give you the date of manufacture.
If you would post the serial number and model number,I can give you a date of manufacture.
What is the manufacture date of a Colt AR15 rifle serial number 192754 model SP1
1920
1920
No sn given.
1939-1955
1932