Yes it was Union Butterfield, makers of cutting tools. and yes, they made some good sets in their day.
they were; Union Butterfield, 134 Chestnut Hill Ave. Athol, Massachusetts.
Athol was a busy tool town not too far from Greenfield, which many of you have heard of in the
tool trades. also Millers Falls. and not too far from Springfiels or Worcester.
there were many tool companies in this area. mostly gone today.