The coin appears to have the correct type 1 obverse and correct type 1 reverse for the date. I too would have some concerns about the denticles and the odd area under "United" on the reverse almost looks like a putty to conceal something. I have a counterfeit 1876S that passed the ping test but failed a specific gravity test. I filed the reverse rim to expose the brass core to prove it. Without access to XRF, a specific gravity test is probably your best bet for authentication.
































