Marble "Domed" or "Turtle" weight, 12,5 viss (20,4 kg), Burma (Myanmar), 19th century or earlier

Reference:
Michael Herrfurth and Hartmut Mollat, Beauty and the Beast, Arts of Asia, Special Burma Issue, vol. 43 no. 3, May - June 2013
Donald and Joan Gear, "Earth to Heaven", Appendix 1, The Domed Marble Weights of Burma, Silkworm Books, 1992/2000