Originally Posted by USAZorro

Two observations. Raleigh lightweights stamped with that serial number convention in that location generally ceased to be produced later than 1971 or 1972.

I have a 1971 Competition that has a stamp with that convention, but it is not even a forged dropout (appears to be a top-of-the-line stamped one) that is a Zeus Competition dropout.

Two possibilities for further identification. First, check for a stamp on the front dropout. If there is one, the rears are likely the same. Second, if there is a derailleur hanger on the drive-side rear dropout, it might be possible to make some determinations about the maker with a photo to reference.

Those are nice bikes. Pretty comfortable for long rides, and quite versatile.