Old Style Calendar
Before 1752 the year began on Lady Day, March 25th,. Dates between January 1st and March 24th were at the end of the year. Old Style (O.S.) and New Style (N.S.) are used to indicate whether the year has been adjusted. Often both dates are used.
In 1662 Hampshire County, Massachusetts was formed from the western section of the Massachusetts Bay Colony. Parts of the original county became Hampden, Franklin, Berkshire and Worcester Counties.