Possible horseshoe? And a round thing with teeth

[Coinstar magnet]

I realized that having a back yard next to a house built in 1686 maybe I should look no further to detect...tonight I pulled out a window weight (not pictured) a round metal piece with teeth and a possible horseshoe which I am wondering if it is could someone put a date on it? Nothing earth shattering but I need to see what's buried in my yard...
Thanks for viewing and apologies in advance for the cell phone photos...

 

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[ARC]

Stove burner ring ?
Drain grate with center rotted out ?

 

[Digger RJ]

I realized that having a back yard next to a house built in 1686 maybe I should look no further to detect...tonight I pulled out a window weight (not pictured) a round metal piece with teeth and a possible horseshoe which I am wondering if it is could someone put a date on it? Nothing earth shattering but I need to see what's buried in my yard...
Thanks for viewing and apologies in advance for the cell phone photos...

Nice!!! Congrats!!!

 

[Almy]

Looks like a corrective horseshoe. Very rusted. Likely old.

 

[Coinstar magnet]

Looks like a corrective horseshoe. Very rusted. Likely old.

Thank you Almy...I appreciate your input!