🔎 UNIDENTIFIED Banister buckle

[jjjwada73]

I need help identifying this buckle. Brass that was nickel-plated and via the reverse stamped impression, it reads "BANISTERS PAT. MAR 15". However, I don't see a year. I know there is an 1864 Banister Centennial buckle this is different and much smaller. Any help is appreciated and TIA!

 

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[Mud Hut]

I am not sure about yours, but Banisters made buckles around 1864.