|The red Colour is the King's Company colour with the crown and cypher of George II. Part of the Colour has been cut off so that two of the corner devices are missing. Corner devices were introduced in Queen Anne's reign and were the Rose, the Thistle, the Fleur-de-Lys and the Harp. The Fleur-de-Lys represents Britain's claim to the French Throne.
The other Colour is the third Company Colour - the Golden Fleur-de-Lys and the number III in the canton. The Union Flag here has the Irish part missing ie the red saltire. This is how the national flag looked between 1707 and 1801.
Regimental Colours | Regimental details