It is a rather odd serial number. Seems to me like it is missing a numeral as the first digit to indicate the year. From 1959 to 1968 - The last digit of the year was used.
Example: Serial number 9L12345
9 would be the year of manufacture (either 1959 or 1969)
L would stand for the long action, the FN action
12345 would be the serial number
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