Please ID mandarine variety

[Denis]

[SoCal2warm]

Looks very much like Satsuma

However, if they are all very small and none of them are medium-sized, it could also be Kishu.

Kishu is believed to be one of the parents of Satsuma, which explains the close resemblence.
However, Satsuma has more cold hardiness, so if these are being imported from Southern Russia or Georgia I would think it would be more likely to be Satsuma.

The flavor or Satsuma (and especially the smell of the oils in the peel) tends to be a bit more aromatic than Kishu.

Kishu can go under different names, and it might be sold as "Pixie", or maybe "fairy" in your country, I'm not sure.

They are both really good varieties (in my personal opinion), have few seeds, often have none, and the peel is effortless to remove.

[Sylvain]

Kishu and Pixie are two different things.
Kishu is Citrus kinokuni and Pixie is an hybrid. https://citrusvariety.ucr.edu/citrus/pixie.html

Denis, what is the taste of the fruits? Sweet or sour?

[Ilya11]

What was  origin of these fruits? Were they from a shop or came from the Black Sea Caucasian coast? Could you please post a picture of cut fruit? For me it looks more like Shivamikan (Citrus leiocarpa)