Third Period Black Mark - 1926 - 1946 Introduced in 1926, possibly to mark the Wembley Exhibition of that year. It also contains the registry mark REG No 0857. Interestingly this registry mark dates from 1884 but was only used from 1926! This mark is always black and was used up to 1946.
Question: When did the third period of Belleek come out?