<p>Stielgranate 41 ammunition for the PAK 36 37 mm gun.  It was introduced in late 1941 in order to give the PAK 36 guns some ability to deal with heavily armored tanks appearing on the battlefield at that time.  The shell, many times larger than the 37 mm caliber and hence inserted into the front of the barrel to be fired, contained a shaped charge and had a range of about 300 m. 
Displayed in Finnish Tank Museum (Panssarimuseo) in Parola. 
Photo taken on July 14, <a href="//commons.wikimedia.org/wiki/2006" title="2006">2006</a>.
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Source: Photo by me, <a href="//commons.wikimedia.org/w/index.php?title=User:Balcer&amp;action=edit&amp;redlink=1" class="new" title="User:Balcer (page does not exist)">User:Balcer</a>.
<a href="//commons.wikimedia.org/wiki/User:Balcer~commonswiki" title="User:Balcer~commonswiki">Balcer~commonswiki</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>