清嘉慶 青花蒼龍教子圖荸薺瓶 《大清嘉慶年製》款

the compressed globular body surmounted by a tall cylindrical neck with a flared rim, finely painted with a large five-clawed dragon writhing amid flames and clouds, with its young below striding among crashing waves, the base with a six-character seal mark

Louis Joseph, Inc.，波士頓，麻省，1950年代末至1960年代初

There is restoration to the rim to cover some losses to a section measuring approx. 2.9 cm wide, as well as to cover an approx. 3.8 cm section that has been broken into three pieces and restuck. A section of the foot ring appears to have been very slightly polished to make the vase sits evenly, possibly original to manufacture. Some very light surface wear and minor firing imperfections, as can be expected.
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.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.

Compare an almost identical vase, possibly the pair to the present lot, sold at Bonhams San Francisco, 16th December 2014, lot 8331. 

A blue and white Jiaqing mark and period vase of the same form and painted with the same borders, but with numerous striding and writhing dragons amidst cloud scrolls, in the Qing Court Collection is illustrated in The Complete Collection of Treasures of the Palace Museum. Blue and White Porcelain with Underglaze Red, vol. III, Hong Kong, 2000, pl. 143.