One cent Lincoln undated -mint errors

Hello  everyone

I have this one cent Lincoln coin I don't now is somw of kind mint errors or something else 

1.date not readable 

2.weight's 3,51 g

3.thickness 2,10 mm

4.diametar 18.50 mm

Thx for the help

I don't think that it is a coin.  One side looks like it was once a button.

it's possibly ….