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6n is '90 and 7n, '91.
With typical Campag certainty, the second digit might refer to the half of the year of manufacture (ie n1 = Jan. to Jun.) or the quarter (ie n1 = Jan. to Mar.).
Either way, no one would know without checking and it's entirely possible they were remaindered stock which wasn't actually issued until '92.
Scilly.Suffolk
Fisk
The codes that are in the square boxes are 71 and 62.