RGS meaning in Community ?

The Rollinsford Grade School is a historic school building at 487 Locust Street in Rollinsford, New Hampshire. Opened in 1937, and still in use as an elementary school, it was the first school building commissioned by the prominent Durham firm Huddleston & Hersey, whose principal, Eric Huddleston, designed many buildings for the University of New Hampshire as the first campus architect. The grounds of the school are also notable as the burial site of Obo II, considered the father of the American Cocker Spaniel breed of dog. The property was listed with statewide significance on the National Register of Historic Places in 2015.