Though it was thimble at first but not

[Cfmct]

It almost looks like what I use on my boat canvas..

https://www.bing.com/images/search?...607994790147457334&selectedIndex=0&ajaxhist=0

 

[Crackerjack]

Kind of resembles a radio crystal.

 

[jga5367]

Meat casing clips

http://www.sausagemaker.com/Casing-Clips-100-Pack-p/17-2516.htm

Thanks so much for the ID.