Button knows

[Sonorguy]

looking for someone who knows buttons, I found this button with little loop attached, any idea what it may have been on and the age?
found way out in the woods right beside a tree. I may need to get better pics, wife took these real quick for me..

 

[longbone]

Half of a cuff link.

 

[Sonorguy]

cool, thanks, I found several that they call 'sleeve buttons' that have a similar loop.

 

[riveraiders60]

Collar button maybe. early 1900s