Hi. I have acquired these 4 from Ferghana Valley, in Kyrgyzstan.

For the largest one (25mm, 2.95g), I have found a reference that might be a match:

Turgesh's Khaganate, Semirechie, 8-9 cent AD, Kamyshev #24

For the smaller ones (21mm, 1.88g respectively 1.51g), I have found similar ones listed as "Sogdian coins", but I could not get into more specifics

The smallest one (10mm, 0.52g) is puzzling, I could find no reference at all to such a type.

Could you give me more clues or point me out where I could find matches?

Thanks