Might be contract-made by another manufacturer. From that perspective, the overall shape/pattern looks a lot like similar knives made by Schrade (or Schrade-Walden as they were named, looking back into the 1960s in particular). Manufacturers like Schrade and Camillus did a lot of contract work for the U.S. Government for military knives, and Craftsman (Sears) has also been known to have their own-branded knives made by those mfrs, based on the same companies' existing patterns, and perhaps with different handle materials or other unique embellishments (like tang stamps) for their own branded models.
Details appear the same, like the overall shape/curvature/thickness of the marlinspike, the location of the nail nick on the blade, and the 'PRESS DOWN' stamping on the bail/lock release all seem to match, between the two, with the handles themselves being the major difference.
A seller pic from the web, of a Schrade-Walden model 735 (listed as 4-1/8" closed, with 2-3/4" blade length):
Don't know if it's rare or not. But it's a nice one, nevertheless.
