I've been doing some research about my great grandfather, his name was Thomas Roberts from Swansea and was born around 1895. He served in world war 1 at mametz wood and later on at Pilcem ridge. The medal pictured above is the only one missing from his collection. It was sold after his death around 1955. Are there any identification marks on the back which could indicate if this was his medal. I can provide details if needed. Many thanks