Looks like buttons.

I have decided to list all 4 of these artifacts together. Ill call them A1,A2,A3,A4. These are all in tough shape and may never be identified. I did find a recent dime with the same color patina, so these artifacts may not be that old.
A1 has a hole in it. I am not sure if it is a tool tag or some other artifact that someone used as a necklace.
A2 has a fish scale pattern and seems most likely to be a button. It seems like there is a small circle on the back in the center. Possibly where the loop attached.  
A3 Seems like a button, but has no marks on it. Seems a bit flimsy and has some type of lip on it.  
A4 is a thin large metal disk with no type of pattern or markings on it.  
When I dug these I thought for sure large cent. Couple of them came up as a quarter. Can't win them all. Any help would be appreciated.  

A 1 looks like it might be a holed coin. It looks like it could have been badly burned.
A2 I think is a colonial flat button
A3  It looks like there is solder around the rim. If there is it is probably a mid to late 1700's expansion button.  They had the face soldered onto the back and the back had 2 holes in it to let the  gases from the soldering escape.
A 4 I have no idea but could be a big flat button

I'd say pound that spot soldier! 
 

Thanks for your input vayank.
Will do 4-H.