Weird button. Can anyone help?

[smf399]

Found this this in the back of a 1860s house in a old bottle dump. It is about 18 by 7 mm. Probably copper. If anybody knows anything that would be great.

 

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[TheCannonballGuy]

It is part of an early-1800s cufflink. Note that the loop is set quite deeply into the back. That's not proper for a button loop. Unfortunately I do not have a photo of an intact cufflink of that type. It consists of two small, narrow oval-shaped "buttons" connected by a "chain-link" of brass wire.

 

[CRUSADER]

Agreed, half of an 19th C cufflink