Type 19 Other Ranks Badge.
This pattern of badge has a small sweat hole behind the Rose which would suggest a particular makers variation. This example has a slider with a makers mark with the letters ‘FN B’HAM which is short for F Narborough of Birmingham.
What cannot be seen is an additional small round sweat hole behind the Coronet that is obscured by solder. This example can be dated to the WW1 period (1914-1919).