Heavy Silver Platter from 1940's (or 30's).. can anyone id.. Sterling?

American Silver
1

IMG_0074
IMG_00742576×1932 1.31 MB

IMG_0073
IMG_00732576×1932 954 KB

IMG_0076
IMG_00765152×3864 3.32 MB

2

There seems to be too much copper showing through for anything better than electroplate.

Phil

3

Phil… Thank you so so much. Can you id the hallmark for me? Much Appreciated.
Diane

4

That manufacturer’s mark (it is not a hallmark) has come up before but as far as I know has not been identified.

5

Thank you so much… You are so kind…