For English and Continental examples of late 17th century crizzled glass vases from which the present pair take their inspiration, see C. Sheppard, A Collection of Fine Glass from the Restoration to the Regency, London, 1990; also Dwight P. Lanmon, The Golden Age of English Glass 1650-1775, the Collection of John H. Bryan, 2009, cat. no. 2a,b, and an example in the Victoria & Albert Museum, London (museum no. C.120-1916).