Seal of James Stuart as Lord High Admiral of England and Ireland and Lord Warden of the Cinque Ports, when Duke of York. It depicts the Royal Arms on the sail of a warship. Inscription: 'SIGIL . ILLVS . DVCIS . EBOR . ALBA . COM. VLTON. SVMMI . ANGLIAE . & . HIB . ARCHITHAE . GVARD . QVINQ . PORT . PRACLA. ORD . GAR . MIL & CT'. The cast is mounted on an emulsioned plywood backboard with a label.