vintage Oneida Cambridge coasters or plates, Chippendale Queen Anne armetale type pewter

Vintage Oneida 'pewter' plates or coasters, armetale type metal, aluminum I think? These are marked Cambridge, and have a Chippendale or Queen Anne period style, though they're 20th century vintage not antique.

It's a set of four, much used small plates. I believe they are probably intended as coasters, they measure about 3" across the center, and 4 1/4" across the rim.

These look to me as though they've been used as butter pats or maybe 'toy' dishes, lots of soil and some scratching. A good polishing would help, but I'll leave that up to you!