Bucharský chanát

Flag of Herat until 1842.svg
After the assassination of Nader Shah of Persia who ruled over most of what is now Afghanistan, local leader Ahmad Shah founded the Durrani Empire in 1747, centred in Kandahar and considered the beginning of modern Afghanistan. After the collapse of the empire in 1823 its flag, a green-white-green triband, remained in use in the Emirate of Herat (1818-1842).

Flag of the Shaybanid Uzbek State (Khanate of Bukhra) in 1510.svg
Autor: CentralAsianEditor, Licence: CC BY 4.0
Flag of the Shaybanid Uzbek state under the rule of Uzbek Khan Muhammad Shaybani, source: https://commons.wikimedia.org/wiki/File:Uzbek_Khan_Muhammad_Shaybani_flag_during_the_Battle_at_Merv_in_1510.png

Khanate of Bukhara Mawara'nnahr (1500-1785).png
Autor: Akhemen, Licence: CC BY-SA 4.0
The territory of the Khanate of Bukhara Mawara'nnahr (1500-1785) in the period of the highest prosperity, without temporary territories and vassal states.

One of the 3 flags of the Kokand khanate.png
Autor: Spiridon Ion Cepleanu, Licence: CC BY-SA 4.0
One of the 3 flags of the Kokand khanate, since http://www.crwflags.com/fotw/flags/su_cak.html

Timurid.svg
Autor: User:Stannered, Licence: CC BY-SA 3.0

TIMURID THREE ANNULETS SYMBOL:
Three annulets symbol of the Timurids. See article [1] for precise discussion.

FROM THE CATALAN ATLAS:
In the Catalan Atlas (1375), only this flag is used for Eastern Mongol dominions, and it corresponds to the Mongol Yuan dynasty, not the Timurid Empire, which is not mentioned in the Catalan Atlas and was created too late (1370) to appear in the Catalan Atlas anyway.

STUDY OF THE FLAG by Yuka Kadoi, Faculty Member, University of Vienna ( (2010). "On the Timurid flag". Beiträge zur islamischen Kunst und Archäologie 2: 148.):

Yuka Kadoi studied the possibility that the "brown or originally silver flag with three circles or balls" in the Catalan Atlas could be associated with the "earlier dominions of the Timurid Empire", specifically referencing a flag shown over the city is camull (Khamil) in Xinjiang. She also quotes Ruy González de Clavijo (d. 1412), a Spanish ambassador who visited the Timurid court in 1404, who describes a a relevant emblematic design adopted by Timur:
"The special armorial bearing of Timur is the three circlets set thus to shape a triangle, which same it is said signifies that he Timur is lord of all three quarters of the world. This device Timur has ordered to be set on the coins that he has stuck, and on all buildings that he has erected (…) These three circlets which, as said, are like the letter O thrice repeated to form a triangle, further are the imprint of Timur’s seal, and again by his special order are added so as to be seen patent on all the coins stuck by those princes who are become tributary to his government."
She also notes the existence of Timur umbrella detail with three-dots decorative motif.
Some contemporary coins from Samarkand also have the three dots as a motif. [2]
Beyond this, scant confirmation.

The flag referenced by Kadoi would actually be this one: , the flag with the three red crescent moons which is seen all over eastern Asian in the Catalan Atlas, and which is simply the flag of the Empire of the Great Khan (Yuan China) ((angličtina) (28 October 2013) The World Beyond Europe in the Romance Epics of Boiardo and Ariosto, University of Toronto Press, p. 32 ISBN: 978-1-4426-6667-2. )

War flag of Khanate of Bukhara.svg
Autor: Samhanin, Licence: CC0
War flag of Khanate of Bukhara. This flag used in Khanate of Bukhara in the Battle of Marv by Muin Musavvir's painting.

Flag of Emirate of Bukhara-Buxoro Amirligi Bayrog'i.svg
Autor: CentralAsianEditor, Licence: CC BY 4.0
Flag of Emirate of Bukhara. Source for design: https://polona.pl/item-view/aaa08cbe-8fbd-451f-ad9e-f1205fa4fbe6?page=10