The NAMCO Block, more recently known as Armory Square Apartments has a rich and varied history. The building is a four-story, brick apartment block composed of nine attached apartment buildings containing 72 apartments. Constructed in 1920-22, the Namco Block exhibits basic Colonial Revival features and is said to be the largest apartment block in the State of Vermont. The building is prominently sited at the corner of Union and Main Streets in Windsor on the north bank of Mill Brook.
The building is unique in Windsor and is a rare model of company apartment housing in Vermont. It is significant as a notable example of company housing built during a time of post-war prosperity at the National Acme Company (NAMCO) in Windsor. As Windsor's largest employer from 1915 to 1930, NAMCO's success was dependent on, among other things, its ability to attract labor from outside of Windsor and to house those workers in proximity to the factory. As a direct result of the need for the National Acme Company to staff the Windsor plant, the town's population doubled during World War I. NAMCO and its predecessor, the Windsor Machine Company, were Windsor's largest employers through the first three decades of the 20th century.