This is a MCM Very Large Serving Bowl Marked 1958 Los Angeles Potteries. It is in excellent condition commensurate with age except for two small chips on the underside of the lip 7/8" and 1/4" respectively. They cannot be seen from the top of the bowl. (See photos).
This would make a gorgeous bowl in which to serve salad but can be used as a decorative piece as well.
It measures 13 1/2" in Diameter x 4" Tall.