Railway, South Eastern Seal, Image by StuE, Found by Alex Larkin.
Found at Purleigh, Essex, 17mm, 8.6g
Both sides - S.E. / 5 inscription around - .RAILWAY. curving downward COMPANY curving upward.
Suspected to be a seal from the South Eastern Railway 1836 - 1922, however the current franchise, London & South Eastern Railway Limited, still trades as Southeastern