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The "S" prefixed number is the serial number, of course; the three stampings in the action side below it are various Belgian Proofmarks and/or View Marks.
The FN factory is in Herstal, Belgium, and the law there requires that gun actions be viewed as having meeting construction standards safisfactorily, and to be proved as safe to fire, as tested through the use of a controlled overload (aka: proof load).
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