Vintage Blue Gray Enamelware or Graniteware  Marble / Sponge swirled Design
Colander Strainer.
Some chips on enamel and rust on back side. Otherwise, pretty nice condition.
Measures: 10" wide by about 3" high.
I'm not sure of the age. Weighs about 12 ounces and will be over 1 lb with packaging.
Note the holes are in the old style - top sides and bottom.