Buchette del vino—also known as wine windows-are small, arched openings found in the walls of historic buildings in Florence and other parts of Tuscany, Italy. They were originally created during the 17th century, particularly during outbreaks of the plague, as a sanitary way for noble families and merchants to sell wine directly to the public without direct contact.
A customer would knock, hand over a flask and some coins, and the wine would be poured through the window. The window would then be closed again, maintaining hygiene and limiting exposure. These windows were often set low on the wall, just above waist height.
Via : thishowthingswork