5Ц4С (5Z4G) rectifier coke-bottle, made by Vostok in 1966. This is the older version of 5Ц4С; later and more common one has plain cylindrical bottle
<a href="//commons.wikimedia.org/w/index.php?title=User:Retired_electrician&amp;action=edit&amp;redlink=1" class="new" title="User:Retired electrician (page does not exist)">Retired electrician</a>
2022-12-30 05:42:40
<span class="int-own-work" lang="en">Own work</span>