This is a very old interesting provincial Chinese stoneware Celadon Jar, probably Longquan, with fluted or ribbed decoration, which we date to the Ming Dynasty, between the 14th and 16th Centuries.
 
The Jar has an interesting circular baluster shape with an open everted rim and low foot. It has been decorated with moulded vertical flutes or ribs to its lower half. The base is concave and fairly deep. The Jar has a mossy-olive green colour having a celadon glaze which runs from the base to the upper rim as it would have been glazed upside down, with some glaze around the top section of the inner rim. Unglazed parts fire to a terracotta brown colour at the rim, lower body and the foot rim.
 
The piece is unmarked but for similar pieces see the superb book: Chinese Ceramics by He Li published by Thames & Hudson, 1996; pages 164 to 184.
 
Dimensions: 
Height: 16.26 cm (6.4 in)Diameter: 20.32 cm (8 in)
Condition: 
 Good antique condition for its age. NO restoration. Some glaze loss and minor chipping to outer foot rim. NO Cracks.
 
NOTES Longquan is a city in South west China. These wares were produced over a long time period from 959 to 1550; which covers the Northern Song, Southern Song, Yuan and the early Ming periods from 1368 for approximately 200 years. Production was on a large scale with the wares forming an important export market for about 600 years. Colours centred on olive green but greenish blues and browns were also made. There eventual demise came when they were replaced by Blue and white porcelain from Jingdezhen.