I'm trying to research the age of a vintage Swiss-made Allegro that I recently found. It has a serial number on a pad on the seat tube, just below the left hand side of the seat cluster. The number is 99116. The current owner indicated he thought it was around 1959. Its a 3-speed with a Simplex 3-sprocket derailleur, nervex-like lugs on a Reynolds 531 3-main tube frame. The component makeup is clearly way older than my base of knowledge (early '70s). Does anyone know anything about these old Allegros?