Probably July 29, 1969 by the date code on the flap.
Could you share the info on code breaking?
It's sort of complicated, but I have it. The leading letter determines the year and whether it is the first half or the second half of that year. The other letter designates the month. The number is the day of the month. The year letters cycle every 11 years. Winchester's date code is similar but not identical. Sometimes the date code uses other numbers to indicate the loading line.
Head stamp is R A 69.
That is the year of manufacture...........Head stamp is R A 69.
Probably July 29, 1969 by the date code on the flap.