Roalex Co., Forest Hills, NJ, circa 1960's.
(plastic puzzle with 31 tiles on a cardboard card, 5.5" x 7.5")

A detailed analysis of this puzzle (that concludes by liking the solution shown above) is presented by (M. Keith [2011], "Vintage Plastic Sliding-Letter Puzzles" Word Ways 44:4, 310-31; see also M. Keith [2012], "More Sliding-Letter Puzzles").