Antique Victorian Era Gold? Wedding Band Marked “Pat Dec 27.70” (Dec 27th 1870).

Antique victorian era Gold Plate Wedding Band Marked “Pat Dec 27.70” (Dec 27th 1870). I did the 10k gold acid test. See last two pics. I scratched 4 different area’s on the band, the first Pic shows the acid test right after the scratch, the second Pic shows whats left after a few minutes. I’m assuming its gold plate from the acid test.