H. P. Gibson & Sons Limited was formed in 1919.
Gibson Game Company
From Dice Maestro Ltd - http://www.dicemaestro.com/vintage-games/retroactive.asp
"Information about H P Gibson & Sons
In 1903 Harry Percy Gibson started The International Card Company, supplying stationers with card and printed products. In 1919 the company was sold to the De La Rue company and H. P. Gibson & Sons Limited was formed in 1919. Although the International Series brand continued to be used on some products right up to the early 1980s, the company made its name with the HPG Series brand, which included L'Attaque and Dover Patrol. The company is now best known for its jigsaws."