Film ID: YFA 6412 KIT KAT: SALMON 2003 Visitor TabsDescription The original four-finger version of the bar was developed after a worker at the Rowntree's factory, York put a suggestion in the recommendation box for a snack that a "man could have in his lunch box for work". The product was launched in September 1935 in the UK as Rowntree's Chocolate Crisp, and the later two-finger version was launched on May 15, 1936. Rowntree's Chocolate Crisp was renamed Kit Kat Chocolate Crisp in 1937, and after World War II just Kit Kat. Slogan 30 secs: Have a break. Have a Kit Kat. Slogan 10 secs: Have a well-earned break and a Kit Kat this Friday at 3 o'clock.