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http://branfordbike.com/m/articles/cassettes-and-cogs-pg60.htm
Here you are, I think that going by the chart they are the 2nd gen 8 speed ones...
I think this is the 1st gen which used Exa Drive cassettes.
If you check the bottom pic of the hub at position 8 o'clock you'll see a much wider splint, typical Exa Drive.
Later versions were 9-10-11.
Lovely rims.