Rowntree's chocolate covered wafer bar was first introduced in England in 1935 and was renamed Kit Kat in 1937. In the 1940's Kit Kat was exported and sold in Canada.
From 1945-1947 the original red wrapper was replaced by blue due to the shortage of milk.
I love the Rowntree logo on this 10cent wrapper and I seem to enjoy the brand design a lot more here, than I did when it was reintroduced by Nestle after they bought Rowntree in 1988
It's interesting how certain design elements are are phased in or out. The chocolate bar for example or slight lettering changes. You can also see here the number of grams the bar weighs fluctuating and then it's really super to see the evolution of Nestle's continual logo change.