No idea on this one.

[Garabaldi]

Found this with CW and War of 1812 artifacts. a piece was broken off of the top rim. Has a pattern on it.

 

Amazon Forum Fav 👍

Diving for Pleasure and Treasure - Grab it through Amazon!

[Charlie P. (NY)]

Here's a pre Civil War mechanical pencil. Just as a comparison.

 

Amazon Forum Fav 👍

Upgraded Night Vision Monocular Digital Infrared Monocular Telescope for 100% Darkness with 8X Zoom - Grab it through Amazon!

[vayank54]

I've dug quite a few broken and a few whole and based on what I've dug and seen I think it is part of a mechanical pencil.

 

[Garabaldi]

Interesting, first type find for me. I was not aware they made mechanical pencil back then. Thanks all for the help.