It was started in 59 and shipped in 63 without a serial number.

The date code is LFK
http://www.remingtonsociety.com/rsa/questions/barrelcodes

I have older, newer, cheaper, more costly, bigger and smaller 22 rifles, but that is my go to killer 22.

I tag guns to try to keep track of them. I have been buying guns for 53 years and my memory is not so good.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps