These are my Grandfather, Lt-Col George Stratford Mardall's medals. He joined the Natal Mounted Police in 1879, retired from the Natal Police in 1911 and became Inspector of Prisons until 1915 when he retired. He was subsequently awarded the OBE. I can identify all the medals except the one on the right. Please can anyone help? The other medals are (from left) OBE, South Africa Medal (for Anglo-Zulu War 1879), Cape Colony General Service Medal (with clasp for Basutoland 1880), Queen's South Africa Medal (with 4 clasps including Tugela Heights and Relief of Ladysmith), Natal Native Rebellion 1906 and clasp, Coronation of Edward VII 1902. I would be most grateful for any help.