These were indeed produced by FN in Herstal near Liege, Belgium. In the early 1950s the European countries started to rearm, so the need for 9mm para ammunition started to grow again. Oxyless is the phrase used for the non-corrosive primer material that FN used.
The shiny bullets are nickle plated. You can test the presence of steel with a small magnet. Usually they employ a mild steel jacket which is nickle plated.
Personally I wouldn't shoot it. It is not that valuable to collectors, but why shoot vintage ammo when you can get and shoot modern ammo for less?
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