Dating chine by trademark
Although it is not definite why this occurred, it is likely that this product was made during the First World War when materials were difficult to acquire and inferior materials were used.
Third Period Black Mark - 1926 - 1946 Introduced in 1926, possibly to mark the Wembley Exhibition of that year. Interestingly this registry mark dates from 1884 but was only used from 1926! Around scroll with Celtic decoration and the words "deanta in eireann" (made in Ireland) added.
However one explanation given was that a green mark was less noticeable looking at it from the inside of a Belleek piece!
The green fifth mark was introduced in 1955 and a registry "R" replaced the old registered number "0857" It remained until 1965 when the green 6th mark was made smaller and the "R" was positioned above the harp on the stamp.
Sometimes discolouration or fading is seen in this mark.Some pieces of Belleek also carry the British Patent Office registration mark which gives the date of registration, not the date the piece was manufactured.During this period Belleek also used impressed mark, with the words "Belleek, CO.A circle with Celtic knot work was added with the Gaelic words "deanta in éireann" meaning made in Ireland.
The fourth mark was introduced in 1946 with the only difference between it and the preceding mark was that the colour changed to green. Perhaps it was simply to have a different colour of mark.
On Earthenware the stamp Belleek changed to "Melvin Ware" in 1936 probably to distinguish it from the more prestigious Parian China.