Rank insignia of the USSR Armed Forces/ Sea war fleet (Navy), here “Admiral of the fleet of the Soviet Union” (OF-10) – shoulder strap dress uniform 1955-1991.
<a href="//commons.wikimedia.org/wiki/User:F_l_a_n_k_e_r" title="User:F l a n k e r">F l a n k e r</a>
CC BY 3.0
various images of the real thing