A George II silver butter shell

A George II silver butter shell, maker's mark only, struck twice, for Peter Archambo I, circa 1730, conventional shell form, on two shell and coral feet, engraved with a crest, width 11cm, approx. weight 5.5oz. The crest is that of Carew, of Carew Castle, Pembrokeshire and of Haccombe, Devonshire.