Lithography throws up plenty of minor printing varieties, and here is an unlisted one that is perhaps worth sharing. The “N” in “NEW HEBRIDES” is damaged. The Stanley Gibbons Elizabethan catalogue doesn’t list it. Whether it is a constant variety, or its position, hasn’t been established.
The stamp is New Hebrides 1965 55c deep bluish green and lavender SG 113, the higher value in the commemorative set, marking International Co-operation Year.