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Found a couple in similar condition and simply applied WD40, wrapped them in a paper towel and placed in a sandwich baggie, and left to soak for a couple of days.
Then cleaned them with a tooth brush and some tooth picks...came out looking pretty good.
Might have a survivor worth keeping...
Looks like an antique Camillus knifew shield http://boyscoutknives.com/camillusmore/CamcoJiggedDelrinJackw_CrestShield.jpg