vintage covered serving dish, plain ivory porcelain dinnerware casserole vegetable bowl

Unmarked plain undecorated (no trim) ivory porcelain serving dish with lid, in excellent condition. This would work well with vintage Franciscan ivory, or Syracuse Old Ivory, or Pickard or Lenox patterns. I don't know the maker or pattern name, this has been one of those pieces very difficult to pin down.

It's 9 1/2" across the handles, on the small side for a serving dish. I'm guessing 1950s - 1980s, American made just from the look of it. But I don't know for sure. It's in excellent condition without damage or wear.