Finnish 95 S 58 recoilless rifle. This model shortly replaced by the improved 95 S 58-61. Photographed in RUK-museum in Hamina.
<a href="//commons.wikimedia.org/wiki/User:MKFI" title="User:MKFI">MKFI</a>
<span class="int-own-work" lang="en">Own work</span>