For an introduction to Asian (opium) weights see this article written by Sylvia Fraser-Lu and published in Arts of Asia magazine in 1982.
You can also read the introductory chapter of the book «Earth to Heaven, The Royal Animal-Shaped Weights Of The Burmese Empires» by Donald and Joan Gear.
I found this attempt at dating these weights very interesting.
Finally if you want to discuss any issue about this topic, you can always post comments or ask questions on the opium weights forum.
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