Crownford China and Crownford Giftware Corp. was wholesale /distributing / importing company based in New York City operating from 1946 to 2003. 

Crownford sold many types of decorative items made of china, pottery and glass. A variety of souvenir plates, reproduction milk bottles, glass kitchen canister sets, liquor decanters and other items were sold and are found frequently throughout the United States.

Ware in known to have been made for them in the US, England and Italy

Wheat: J.H. Weatherby and Sons Limited

"The Wheat pattern is today [1985] manufactured by J.H. Weatherby and Sons at its Falcon Pottery in Hanley [Stoke-on-Trent, England]. The firm began producing the pattern in 1970, taking over from Arthur J. Wilkinson Limited of Burslem. Since Weatherby and Sons acquired the blocks, cases and master moulds from Wilkinson, there is likely very little difference between the patterns produced by both companies.

The manufacturing materials were actually purchased by a New York-based firm, Crownford Gifts (hence the ROYAL CROWNFORD IRONSTONE in the mark), when Wilkinson ceased operation, and Weatherby and Sons was then requested to produce the pattern. 

In Canada the distributor of the pattern is Frederick Dickson and Company Limited, which, prior to 1970, supplied the Wilkinson-made Wheat pattern to Canadian stores."

Source: Lynne Sussman, The Wheat Pattern - Studies in Archaeology Architecture and History National Historic Parks and Sites Branch Parks Canada, 1985