My guesstimate on yours is the carbine was assembled in 1969 or by early 1970. Usually the two dates were within a couple months of each other, but not always. So there is a date of manufacture of the receiver and a later date of manufacture for the carbine. Keep in mind serial numbers are specific to the receiver and not when the carbine was finally assembled. I can only estimate a date of manufacture.
Yours is one of a handful I have records on during that s/n range that are absent the So. El Monte, CA to the left side of the receiver at the front. The one exception being, at about s/n 19023 they started adding So. The markings on your carbine are consistent with those used by National Ordnance from s/n 0001 thru at least 32238 (1962 thru abt 1970). I've had to reconstruct what s/n and markings were used by gathering whatever info I could over time. National Ordnance records of when serial numbers were used and/or what markings were used, if such records existed, were not shared outside the company.
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