Williams Ellis & Co. Ltd. of London produced a series of four 200-piece jig-saws, circa late 1940s. The box covers feature unique stylized artwork of Snow White, Happy, and Dopey. Above each puzzle image is text that reads, "A Welcom Product." Puzzle dimensions: 9.5" x 14".
No. 1 - Snow White Surprises the Seven Dwarfs.
No. 2 - A Busy Day for the Seven Dwarfs.
No. 3 - Dwarfs to the Rescue.
No. 4 - Snow White Meets Her Prince.
Also see the 1938-39 Willliams Ellis series of eight 200+ piece puzzles in an early Archive entry.