Kataguchi (spouted bowl) were used to pour saké. They were usually constructed from hardwoods and were covered with several layers of lacquer. The lacquer served both functional and aesthetic purposes. 

Often times, the foot, body, and spout of the kataguchi were made separately and later joined. If you look closely at the photos of this kataguchi, you can see the slot where the spout was added to the body of the bowl.

The exterior of the bowl is decorated with black lacquer, while the inside was done in a red lacquer. Upon closer inspection, the red lacquer has started to wear from continued use; especially noteworthy are the grooves in the bottom of the bowl that have formed as a result of pouring saké over and over.

This kataguchi dates to the Meiji period (1868-1912). 

9 inch bowl diameter x 5.75 height x 3 spout length

See: Rathbun, William. Yo No Bi, The Beauty of Japanese Folk Art p. 52. 1983

Muraoka, Kageo and Kichiemon Okamura. Folk Arts and Crafts of Japan p. 127. 1973

Japan Society, New York. Japanese Folk Art: A Triumph of Simplicity p. 86. 1992