What is this?

[TKS1812]

I found 3 of these today in a construction area by a 1912 railroad bridge. Can anyone tell me what they are? I can make out DURBIN on this one.

 

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[desertexplorer]

Bridge washers, used for building wood beamed bridges.

 

[TKS1812]

Thank you so much!

 

[A2coins]

I concur and I conquor nice ID