Original article from The Connoisseur (1922), pp. 217–221.
Original article from Antique Collecting, vol. 20 no. 7 (December 1985), pp. 27–28.
Original article from Antique Collector (October 1963), p. 178.
Original article from The Antique Dealer and Collectors' Guide (November 1949), pp. 25–27.
Original article from The Connoisseur, vol. 159 no. 640 (June 1962), pp. 117–120.
Original articles from Antiques Bulletin no. 459 (18 April–1 May 1992), pp. 39 and 45–47.
Original article from La Suisse Horlogère (August 1953), pp. 51–58.
Original article from Antique Collecting, vol. 13 no. 7 (December 1978), pp. 30–32.
Original article from The Antique Dealer and Collectors' Guide (May 1981), pp. 61–63.
Original article from Antique Collecting, vol. 14 (July 1979), pp. 87–88.
Original article from The Antique Dealer and Collectors' Guide (May 1981), pp. 58–60.
Original article from Antique Collecting, vol. 16 no. 3 (July/August 1981), pp. 58–59.
Photocopy of an article published in Journal of the Royal Naval Scientific Service (vol. 22 no. 2).