Well the 7mm Remington Mag was introduced in 1962 so going on that and And Flaig was a big mail order house, yea you could at one time buy a rifle and have it mailed to your house. That all changed with the GCA '68. After that abortion of a law was passed you have to deal with and FFL holder for a transfer of a new firearm. Lee Oswald bought his rifle thru the mail, why when they kept records and a local gun shore didn't is one of the on going questions. So you are looking at a date between 62 and 68. Also FN stopped making sporting rifles some time around 65 or 69 do to the high demand for military arms at the time. There were some serious wars going on in Africa at the time, and the demand for FN-FAL's were thru the roof. So to answer you question, 62 to 65 would be a very good guess. That FN action makes the rifle worth keeping, and have a nice custom rifle built from it.
