vintage Case please help

It's an "XX Era" knife made between 1940-1964.

Nice knife and welcome to the forums.
 
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That knife was originally a two blade (with secondary pen blade) jack...model 2231 1/2 SAB. Railsplitter is correct on the stamp, XX era 1940's to 1964. Case has not made that pattern since 1976.

Someone "knocked it down" to make it into a single blade knife.
 
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