How old could these be and what was they used for?

[EDavis]

I know these are some type of hinges but don’t know how old they could be or what they was used on. These came out of my backyard which my house was built in 1920. Seems these could be older. I cleaned couple of them but the build up on the one is the way all of them was. Probably around 10 all together around a 10 ft square area spread out 6-12 inches deep. Also found this other strange piece in Dexter Indiana on a property that goes back to mid 19th century…no clue

 

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[KSDirtfisher77]

Looks like sickle bar mower parts.

 

[EDavis]

Looks like sickle bar mower parts.

I’ll look that up..thanks! It’s hard to tell by the picture but I was thinking a type of hinge because there are two small holes like was nailed to wood!

 

[Mud Hut]

These are broken window shutter hinges. I am 99.9% certain about that.

 

[Gare]

Maybe a piece of a chain drive on a manure spreader ?

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