Could you tell me about this pin I have can't find it anywhere on the internet. It's about the size of a penny sterling silver

Could you tell me about this pin I have can't find it anywhere on the internet. It's about the size of a penny sterling silver white enamel round the edge with the words " it's a long way to Tipperary " Red and blue enamel union jack and a British Tommy marching into battle.
I've seen one similar with a field artillery gun on it but not one with the British Tommy on it.