The Society of Friends (Quakers) began in England in the 1650s, when they broke away from the Puritans. Pennsylvania was founded by William Penn, as a safe place for Friends to live and practice their faith.
American colonists continued to use British monetary units, namely the pound, shilling and pence for which £1 (orli) equalled 20s and 1s equalled 12d. In 1792 the dollar was established as the basic unit of currency.
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.