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Fisk-
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
Yes. And no. :)
I'd forgotten that second gen. Athena inherited 1st gen. Chorus (when 2nd gen. Chorus inherited Croce D'Aune).
What is the date code (the two digit number in the square box on the reverse)?