Is the green Belleek mark older than the gold Belleek mark?

The gold Belleek mark is dated between 1981-1992. There are a few different green Belleek marks that date from 1946-1981. The green mark is older and most pieces with the green mark are worth more than the gold mark. The oldest Belleek mark is black (starting in 1863) and the current colour is blue.