not really an expert or anything, but that looks like an Eisenhower to me. Pattern #63 (some info from the AAPK research area here:
http://www.allaboutpocketknives.com/wr_ ... _75.php#63)
Is there a pattern number stamped on the back of the large blade? that would clear up any questions for sure. The stamp I see looks like the current Case stamp, with the X's and dots to mark year of manufacture.