Rings and Dragons Cycle.
Sogdian Mural from Panjakent, Sector VI, Room 1, c. 700-722AD
Tajikistan National Museum of Antiquities, Dushanbe.
Referenced as figure 432 in The military technology of classical Islam by D Nicolle
432. Fresco from Piandjikent Room VI/4, 7th-8th centuries AD, Transoxanian, Hermitage, Leningrad (Aka S, Yaku).
[Aka S = Akademiya Nauk CCCP, Skulptura i Zhivopis Drevnego Pyandzhikenta (Moscow 1959)
Yaku = A. I. Yakubovski and M. Dyakonov, Paintings of Ancient Piandjikent (Moscow 1954)
Both confirm this as sector VI/room 1, not VI/4.
There is little evidence of a scale helmet.]