royal seal?
{this is what Wyon calls the second seal and what Birch calls the third seal]
777 Lett. Pat. (s) granting to John de Mucegros all the property formerly of Thomas son of Thomas, formerly mayor of L. 26 Oct. '265. 31 5 /6-10 -19.
Cal. P. R. 1278-66, 466, 468