obsignātor — Lewis & Short
obsignātor, ōris, m.id.,
I a sealer, sealer up (class.):
litterarum obsignator,Cic. Clu. 66, 186.—Esp., the witnesses who set their seals to a will, Cic. Clu. 13, 37:
testamenti,id. Att. 12 18, b, 2:
decisionis,id. Fl. 36, 89.