A large earthenware mug by William Fishley Holland (1888-1971) in the 1930's. It's a large mug in mint condition. 

Uranium Oxide was used to make the yellow glaze on this mug. It is safe for display but not recommended to drink from. Uranium oxide was a common glaze additive prior to WWII, and Uranium was still used in glazes by many companies, including the company that made Fiesta dinnerware after WWII. The company only stopped using Uranium Oxide in the Fiesta line in 1972, due to low sales resulting in the news about the use of Uranium in its glazes. In 1977 the FDA came out with a report which basically says, not to use acidic foods or beverages with these products that contain Lead, Cadmium, Uranium etc.

This mug measures 4-1/4" tall and 3-1/2" across the lip. It's in mint condition with no flaws, chips or cracks.

William Fishley Holland is highly respected for his throwing and decorating skills, coming from a long line of eminent potters that span 100 years prior. Among his attributes, he is credited with teaching a young Michael Cardew how to throw pots on the potter's wheel. The Fishley Holland potters were highly regarded by both Bernard Leach and Shoji Hamada.

More about the Fishley Holland legend:

Bernard Leach renowned artist of ceramic pottery influenced a great many potters in particular with regards to slipware. Known to some as the father of potters, he trained in Japan under the master potter Kenzan. In Flemington – North Devon, he had an association with William Fishley Holland and had offered William a job.

The Fishley Holland story starts with George Fishley, father of Edmund and Robert Fishley and grandfather of Edwin Beer Fishley (1832-1912, who ran the Fremington Pottery in North Devon from 1865 to 1906. Edwin's grandson, William Fishley Holland worked at the pottery from 1902 and found himself unemployed when his uncles sold the works after Edwin's death.

William went to nearby Braunton and built and managed the Braunton Pottery for a gentleman by the name of Hooper. It was at Braunton that Michael Cardew learnt to throw, under the tuition of William Fishley Holland. In 1921 Hooper became insolvent and the Pottery was sold.

William moved to Clevedon in North Somerset, purchased a piece of land and opened his own pottery. Many other Fishley Hollands followed, including William (his son), Peter, Isabel and George, who added 'DUNSTER' to his signature from 1959 onwards when he moved from Clevedon to Dunster, also in Somerset.