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....I just restored this one a couple of months ago. Mine is from the first period of Follis production, but after the company returned under the (daughter ? granddaughter ?) of the original company owner, they didn't make as many bikes, and all of them were relatively OK. The best ones were quite nice from the 70's time period.
There is an extensive history of Follis here, but you need either to read French or to use Google's translation function.
A shorter history (without all the wonderful period photos of the racing history of Follis) is
here on Classic Lightweights.