A RARE BLUE GLASS VASE WHEEL-CUT MARK AND PERIOD OF QIANLONG

of ganlan form, rising in three gentle curves to incorporate the body swelling from the splayed foot and tapering gracefully before the flared mouth, the glass of a translucent bright blue tone, the base with a four-character wheel-cut mark within a double-square

As visible in the catalogue photo, the glass is crizzled to the interior, but otherwise is in overall good condition, with just minor surface scratches and minute nibbles to the foot.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

Glass vases of this ganlan form are very rare.  The ganlan, or olive-shape, takes its form from the ceramic vases of the Yongzheng period.  This balanced, elegant, slender form is recorded in Geng Baochang, Ming Qing ciqi jianding, Hong Kong, 1993, p. 234, fig. 400, no. 15.  The shape is known from blue and white, monochrome and famille-rose wares. 

Compare an opaque blue glass vase of similar form, with Qianlong mark and of the period in the Andrew Lee collection, illustrated in Elegance and Radiance, Hong Kong, 2000, p. 48.  See also a similar opaque yellow vase sold at Christie's London, 19th June 2001, lot 144.