English: Bust of a man, a defeated Saka warrior, found at Khalchayan, a major site of the Yuezhi (later Kushan) people, in Bactria (modern Surxondaryo Province, Uzbekistan). Painted clay. First century BCE, Termez Achaeological Museum.

This is a Saka warrior, appearing as a defeated enemy in the victory sculptural scenes of the Yuezhi/Kushans at Kalchayan, according to:

1. (in English) (2007). "Nomad Migration in Central Asia (in After Alexander: Central Asia before Islam)". Proceedings of the British Academy 133: 87–98.
   
2. Encyclopedia Iranica "Head of a Saka, from Khalchayan" http://www.iranicaonline.org/articles/greece-viii#prettyPhoto[content]/7/
   
3. Also a Saka warrior according to this source
   
   

"Another helmet that may have a Hellenic (or part-Hellenic) inspiration is the earlier first century BCE helmet of the Khalchayan sculptures of Greco-Bactria depicting a helmeted Saka warrior (Fig. 5).4 The Khalchayan helmet features a distinct “egg shape” with a forward-protruding visor and what appears to be leather rims on the sides of the helmet reaching the neck." Farrokh, K., Karamian, Gh., Kubic, A., & Oshterinani, M.T. (2017). An Examination of Parthian and Sasanian Military Helmets. In “Crowns, hats, turbans and helmets: Headgear in Iranian history volume I” (K. Maksymiuk & Gh. Karamian, Eds.), Siedlce University & Tehran Azad University, pp.121-163