A long and slender neck has been attached to the rounded body of this ewer which also has a long and slender spout atop the neck and a second lidded spout on the body. This variety of ewer is known as the senzan-type, senzan-gata, and was popular in the Tang dynasty, where it was used in offerings to the Buddhist deities and as a personal possession of a monk. The fusatsu-type of ewer which was produced in Japan grew out of this type and thus the senzan-gata had great influence on Japanese artisanship. 
Object label 

This is a rather big water pitcher of the so-called "Sensan-type" with a spout and a pointed lid. It was first cast and then shaped on a lathe. The bottom was cast in one piece with the body, whereas the spout and the pointed lid were cast separately. Judging from the rust on the surface, which appears to have been caused in conjunction with soil, it seems possible that this pitcher had once been buried underground. Since the metal underneath the surface has a whitish appearance, it is considered to be a nickel-like alloy.
This pitcher, though made of thick metal, has an elegant shape with its round body. As the leather-bag shaped spout with its lid is designed in a classic style, this pitcher was probably made during the 8th century. It seems to have been made in China, but the top of the lid with its round corners resembles Korean pitchers made during the Silla dynasty. Further examination is necessary to determine the exact place of production. 
Masterpieces of Nara National Museum. Nara National Museum, 1993, p.118, no.92.