Jig-Words

A word game. The pieces have both letters and black squares on them. The objective is to use all your tiles by making a correct Crossword. The player wins if he has used his last tile. It can be played as a puzzle or it can be played competitively. The box claims: A Boon to the Sick Days of Amusement Entirely New and Novel A 'Service' Favourite 186 tiles The 'Service' reference probably means the game was published within the years 1939 to 1945 (World War II).