A .50 caliber cartridge case with the Frankford Arsenal headstamp.<br>
I made this file myself. I took the photograph, and it is my shell casing.
<a href="https://en.wikipedia.org/wiki/User:Sovtek" class="extiw" title="en:User:Sovtek">Sovtek</a> (<a href="https://en.wikipedia.org/wiki/User_talk:Sovtek" class="extiw" title="en:User talk:Sovtek">talk</a>) (<a href="https://en.wikipedia.org/wiki/Special:ListFiles/Sovtek" class="extiw" title="en:Special:ListFiles/Sovtek">Uploads</a>)
<span class="int-own-work" lang="en">Own work</span>