A bank robbery in Stockbridge this week appears to be the first in the Berkshire County town in almost 80 years and may be just the second ever. Monday’s robbery at Lee Bank also came just weeks after the town’s new police chief started. A Hillsdale, N.Y., man has been arrested and is awaiting extradition to Massachusetts. Chief Robert Eaton Jr., who started last month, said Christopher Blair faces charges of robbery, assault and battery, and larceny in Massachusetts. Heroin addiction was the apparent motive. Richard Wilcox , the former chief, told The Berkshire Eagle that the last bank robbery in town was 1935. According to police records, that was a first.