MCP, Mann, Crossman & Paulin Ltd Seal, Image & Found by Dave Pamment.
Found near Bishps Stortford, 19mm.
Mounted horseman spearing a dragon // M. C. P.
A bag seal showing the distinctive George & the dragon emblem and the initials M.C.P. No product company or organisation has yet been connected to this seal with certainty, however the trade mark of Marstons PLC is an excellent match.