Watch List notes:

British Coins, Henry of Anjou, large fragment of a penny of a West Country mint, struck during the reign of King Stephen (1135-1154), type as William I, Type V, Mack Type 6, +(. )RI (for HENRI) around facing bust, between two stars, rev. cross botonnée over quadrilateral with concave sides, much flatness, otherwise fine, of the highest rarity
This type is shared with a similar issue of William of Gloucester, Mack type 3.
The coin recorded as EMC 2020.0184.