There seems to be some debate about the reason for the number representing the date of manufacture being before the TJ or after it. Being just a single numeral, it would seem logical that there would need to be a method of distinguishing years from different decades. TJ6 and 6TJ therefore would represent 1966 and 1976 or possibly the other way around. In the absence of documentary source evidence, what would be required to establish a definite answer would be the sight of a mark on a piece which was knowingly produced in a particular year. Unfortunately the goblet illustrated has no provenance and cannot therefore be used for this purpose. It would be interesting to know if anyone has such a piece, or knows of one, in order to verify which positioning of the marks applied to which decade.