Remington Model 742 BDL.
Broad serial number blocks are:
1951-1967 1,000-541,000
1968-1975 6,900,000-7,499,999
1975-1978 A6,900,000-A7,499,999
1978-1981 B6,900,000-B7,499,999
There should be some cryptic markings on the left rear of the barrel, just in front of the action.
http://www.remingtonsociety.com/rsa/questions/barrelcodes
Failing that, call them up:
If you will call or email us the serial number and model number we can determine the approximate age of your firearm.
Serial numbers were not required until 1968. For models without a serial number, we may be able to determine the age by the 2-3 letters that are stamped on the barrel.
Contact us through our Help Center by email or call us at 800-243-9700 Mon-Fri 9-5 EST.
I have not seen a Kowa rifle scope. Their spotting scopes are pretty much the world standard for target shooters, though. If this rifle scope is anything close, it is a good one.