River Tyne, spoon

Spoon. Decorated with a key in between the letters I and I, and a chain extending from the ring of the key to form a circle (maker's mark). The letters S, I and M enclosed in a rectangular sinking with escalloped sides, are probably the owners initials. Of English manufacture at the time of James I and VI. Almost 7 inches long. Dredged out of the River Tyne in 1872.