Please help identify this military pin

[Redfish]

While metal detecting around a home built in the 1890s I found a gold eagle pin with the letters O and S on either side of the eagles head. I was hoping one of our many vets could help me identify it. It is about the size of a half dollar with a pin across the back. The eagle has spread wings and the letter O could be a C as the eagles beak pierces it. Thanks for any help you can offer.

[usndiver]

You might have better luck if you post a picture of the pin. Providing the city and state location will help too.

[old timer]

take a look at tomstreasuers.com, maybe they can help.

[82Corp.]

You can contact the The Institute of Heraldry, Ft Belvoir at usarmy.belvoir.hqda.mail.tioh-webmaster@mail.mil They will be able to tell you for sure.