USSR Peoples Comissariat of Communication (N.K.S.) emblen (1933) on telephone cover. Kharkov.
крышки - НКС, фото - <a href="https://ru.wikipedia.org/wiki/User:Vizu" class="extiw" title="ru:User:Vizu">Victor Vizu</a>
<span class="int-own-work" lang="en">Own work</span>