South Merrimack, NH duplex handstamp

20th century

This is a 'four-bar' rubber postmarker commonly used at third- or fourth-class post offices. It derives this nickname from four parallel killer bars that extend to the right of a circular datestamp. The town name and state appear within a circular border. There are four slots in the postmark's center that hold rubber pica type for month, date, time, and year.