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Need help identifying this metal ballpoint pen

Hello Everyone, I'm new to this forum. Found the pen pictured below in a gun collection of all places and am having no luck identifying it. Obviously well made with weight to it. Made out of a non-magnetic metal. Only markings are USA, a SF circle logo and AD9957. Contains a Parker ISO 1275-2 ballpen refill. Don't see a gasket but threads are at least 1/2" long. Sorry about quality of second picture. It is of SF logo and didn't realize quality was so poor. Will try and load better image when I can. Any help will be appreciated.
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