A CHINESE BEIJING BLUE GLASS VASE FOUR CHARACTER QIANLONG MARK AND OF THE PERIOD 1736-95 The pear-shaped body surmounted by a wide tall cylindrical neck which flares towards the rim, supported on a short flared foot, the base incised with the four character reign mark contained within a double square, the translucent glass a deep purplish-blue colour, 25.6cm. Cf. R Zhang, Luster of Autumn Water: Glass of the Qing Imperial Workshop, pp.140-141, no.17 for a comparable blue vase also with a four character Qianlong mark; see also C Brown & D Rabiner, The Robert H Clague Collection: Chinese Glass of the Qing Dynasty, pp.22-23, no.9 for another similar piece. 清乾隆 藍料膽瓶 《乾隆年製》楷書款