Found at an 1850's farm house in Kansas City MO. The large ring is actual size. The only markings I can see are 2 sets of 000 on the large ring. I think these are copper, but could be brass.
If it's actual size on my screen I'd have to say a flue plate, one of those decorative pieces of metal that goes around a stovepipe where it enters a wall
Very cool looking finds Kc
The problem with you saying "actual size" , is that,
we presume that on your comp screen, it is actual size,
but all our screens are different, therefore we can only guess the size
Looks like some of the old mirror frames that you see over an old fashioned wash stand, but I also am guessing at the size. Is it as big a toilet seat or as small as a cheerio? Monty