2.25" with metal back and bar pin. Coattail names are Humphrey/Freeman/Matthews. One the reverse the top half has tan stain on the celluloid and this extends just slightly to become visible on the front from 9 o'clock to 12 o'clock but quite light and almost a hairline so that it is not very distracting at all. Cello also has pinpoint bump by his jacket lapel caused as made by the reverse bar pin. Button still has full gloss and displays very nicely.