Seal of the Commendator of Newbattle Abbey

I was cataloguing some more of the Laing Charters this afternoon. This one has a well preserved seal. Here's the Revd. Anderson's description of the charter:

Charter by Mark [Ker], commendator of the monastery of Newbattle and convent thereof, narrating that the king (James VI) had by letters under the quarter seal presented to the granter, Richard Hamilton, son of John Hamilton, formerly of Cowtcoit, macer, as a lawful tenant in the lands of Cowtcoit, in the sheriffdom of Peebles, which had belonged to John Hamilton in feu-farm, but had been forfeited by him on being convicted of treason; therefore the granter gives the said lands to Richard Hamiltoun in feu-farm: To be held of the granter for £4, 13s. 4d. of annual feu-duty. Dated at Newbattle, 20th December 1568, and signed by the commendator and by the following members of the convent: George Turnbull, George Richardson, George Symsoun, John Bannatyne, John Harwy, Thomas Guld. Seal attached, in fair preservation.