I have an old knife that I would like information about: 7" steel blade with a 4" folding handle with a release mechanism. The word "rEICNI" (WITH "r' lower case) appears above the word "SHANPIAO" with the "S" reversed. The handle is made of a greenish translucent plastic-like material, riveted onto bronze or brass. An airplane etching appears below the words with the lketters "c" and "l" on opposing wings. Any info available?