The Navy depicted is one of a small lot that is virtually unknown to the average collector. It is a part of the contract for the short-lived secessionist Republic of Hawaii Navy. The marking is their crest, a pineapple.
And if you believe that, I know of some special Geschwader General Goering Luftwaffe pieces that were plated to keep moisture condensation at altitude from causing corrosion. <img border="0" alt="[blabla]" title="" src="graemlins/a_smil17.gif" />
Tom A.