Double crane badge for a 1st to 3rd rank civil official, circa 1850 ::

Schuyler Cammann., Harvard Journal of Asian Studies [vol 8], 'The Development of the Mandarin Square', United States of America, 1944.
Schuyler V.R Cammann, Arts of Asia, 'Other Mandarin Squares: Korean, Annamese and Unfamiliar Examples', pg. 116-119, Hong Kong, Mar 1992-Apr 1992, 116-119.
Young Yang Chung, The art of oriental embroidery: history, aesthetics and techniques, London, 1980.
Young Y.Chung., Arts of Pacific Asia Show, New York, 'Hyungbae: Rank Badges of Korea', New York, 1988.

Young Yang Chung, pre Jun 2005, Australia, donated to the Art Gallery of New South Wales, Sydney, April 2005.