MEDALTA POTTERIES STONEWARE MUG
A medium stoneware mug, modeled from the bottom half of the Cypress pitcher, plain wide rim with a raised cord-like design between the rim and the basket-weave bottom, tan interior, brown exterior but unevenly applied with the base tan colour showing through, appears lopsided as the basket-weave design is not parallel to the base and rim. Stamped Medalta Potteries, Red Cliff, Alta., Canada to the underside.
Size: 3.25 x 4.5 x 3.25 in.

This is a Medalta ’66 piece.

“Medalta Potteries (1966) Limited” operated in Redcliff, AB from 1966 to 1986. 

Visit this link for more information about the Redcliff factory.