I have a Sudan Police Service silver hallmarked (London 1925) officer's cap badge with 'B-EL-G' in a scroll (Bahr El Ghazal region). Sudan is a former Anglo-Egyptian Condominium. Can anyone tell me more about their policing in the 1925 era or point me towards any suitable publications. I have perused the internet with limited success. I am also hoping for some indication of its value - it is in excellent condition.