Watch List notes:

Uncertain of Nicaea, Early-mid 13th century. Tetarteron (Bronze, 20 mm, 3.15 g), uncertain mint. I - C / X - C within the angles of a jeweled cross. Rev. Monogram of two Bs, the left with pellets, the right retrograde. DOC 7. SB 2155. Rare and well struck. About extremely fine.