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1936 (the spelunker thinks)
Ming Wilson, Chinese Jades, No. 10
Rose Kerr (ed), T T Tsui Gallery of Chinese Art and Design, V&A, 1991, photo p. 39.
Purchased with the assistance of The Art Fund, the Vallentin Bequest, Sir Percival David and the Universities China Committee
ca. 2000 BC-1600 BC (made)
Blade, shenmu shimao black yazhang, ca. 2000-1600 BC
Length: 33.5 cm, Width: 7 cm across flanges, Thickness: 0.6 cm at butt
China, room 44
Carved nephrite jade
From Shenmu Shimao, north China
Museum no. A.62-1936 
China, room 44, case 8
Nephrite jade, carved museum_number
The blade is concave on both sides and honed to a fine cutting edge. Black nephrite jade. Ceremonial sword for ritual use.
from Shenmu Shimao, China
An ancient Chinese text entitled The Zhouli (Rituals of Zhou) describes a 'zhang' as a ceremonial object to sacrifice to the direction south. But the text gives no description about the shape of the zhang. In the first few decades of the 20th century a fairly large number of jade blades with a curved end were excavated from neolithic sites, the present example being one of them. Chinese archaeologists believe this type of blades is the zhang mentioned in the Zhouli.