Badge Identification

[Craigyc123]

Hi, I’ve recently been given my great grandfather’s WW2 medal ribbons. I was told by my grandmother before she died he sold the medals. I’ve managed to identified the ribbons: war medal, Atlantic star & Pacific star but I can’t identify the uniform/blazer badge. As far as I know he was in the merchant navy so I’m not sure if this is the correct place but here goes!
I’ve gone through hundreds of pictures online but can only find similar not the same.

Thanks for your help.