This tunic is for sale as a tunic of a "first lieutenant of the mounted NKVD". It should be 100% WWII original!
The tunic has the rank chevrons of a captain (kapitan) and the collar tabs of a corporal (yefreitor). The cavalry insignia on the collar tabs are fake.
The wrong composition of the ranks is already a warning but what about the tunic itself? Is it an original RKKA M29/M35 officers tunic? The tunic has no stamps.