✅ SOLVED Button

[gene39]

This button is metal not sure what kind
It has cross cannons on it
It is as big as a quarter
It has an capital A on it
It was found in Oswego New York by the fort
Looking for year and is it worth anything?

 

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[duggap]

Those are collar discs. I don't know my post civil war insignia so I don't know the date, but someone will come along to help.

 

[TheCannonballGuy]

Your find is a US Army Coast Artillery collar-disc insignia. Because the background around the emblem is diamonds with a tiny acorn inside each diamond, your disc dates from 1926 through 1937. Go to the Collar-Disc Insignia webpage linked below and scroll down to "Type 2 Discs."
Dating Metallic Insignia: Collar Disks

The single letter A on your Coast Artillery disc insignia stands for Battery A.
Go to the following webpage and scroll about 2/3rds down the webpage.
Evolution of U.S. Army Artillery Insignia

 

[gene39]

Thank you, I will be posting more soon when the water get warmer.

 

[gene39]

Thanks for the info