Roalex Co., Forest Hills, NJ, circa 1950's and 1960's.
(card is 4.4 by 5.75 inches, puzzle is plastic 2.5 inches by 1/4 inch thick;
the spacing of the copyright information at the bottom varies on some cards)

M. Keith discusses this puzzle and gives the solution shown in the photo above as well as a number of other sentences like "YAMS GROW BUT HIDE" and phrases like "DEAR BOYS WITH GUM" (M. Keith [2011], "Vintage Plastic Sliding-Letter Puzzles" Word Ways 44:4, 310-31; see also M. Keith [2012], "More Sliding-Letter Puzzles"). C. Bates has also found the sentence "I SAW THEM BURY GOD".