Buckle ID Help

[granthansen]

Found this buckle while searching a cellar hole in Lancaster, MA. Other items found date to mid- to late-1800s. Buckle clearly says "APRIS" on it. Bottom left I think is PAT, but I can't make out the patent number. I have it soaking in apple cider vinegar in hopes to remove the cruddy rust. My searches have led me nowhere

 

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[nhbenz]

I think that might read Apr15 maybe?

 

[granthansen]

I think that might read Apr15 maybe?

AAHHHHHHHH!!!!!!!!! You may be right!!!