Large moustache cup and saucer Crown Devon stamp circa 1980,
(this factory produced between 1879 and 1982)
dimensions:
saucer diameter 16.8 cm
cup diameter 11 cm
Height 8.5 cm
Patina of time and use on the enamel.

For information, The moustache cup became popular in the Victorian era to protect men's moustaches when drinking tea. The moustache guard was invented in the 1860s by a British potter Harvey Adams, to protect the moustache from contact with hot tea and from melting moustache wax. Moustache cups were popular in Britain, Europe and the United States until the start of the First World War (Internet source).