Marmalade or Jam Jar

Rectangular jar measures 7" long from handle to handle, 3 1/2" wide and 5" tall to top of handle on lid. Has attached saucer with same grape and leaf design as jar. Inside of jar is discolored from age and/or use. Ladle has small chip (see picture) but this is truly an unusual item you may never find again. I am told it is a Red Cliff China, Grape pattern, made 1961-74. There are no marks but this definitely looks that old. There are no chips, cracks or chiggerbites of any kind on the jar, lid or attached saucer.