Watch List notes:

Britain, North Eastern Region. Corieltavi. Aunt Cost. Ca. A.D. 15-40. AR unit (15 mm, 0.99 g). Aunt Cost Uniface type. Plain / AVN above, CO below, horse with double forelegs left; below, small trefoil ; below tail, lituus (off flan). ABC 1938; Van Arsdell 914-3; BMC 3261; SCBC 403. Toned. Good very fine.

From the KJG Collection of British Celtic Coins. Ex Rudd 101 (September 2008), 40.

It is not certain whether Aunt Cost is one person, or two (Aunt and Cost).