Delta proudly introduces a very limited edition of the Windows demonstrator fountain pen with button-filler in four striking versions, one for each of the four seasons. This collection provides viewing access to Delta’s treasured filling system; The famous button-filler! Take a close look at all the detailed work involved in the intricate and unique filling system. The barrels are hand-turned and painstakingly hand-polished from solid bars of specially designed clear resins and enriched with unique color strokes. The brilliant colors were chosen to convey the artist’s interpretation and visualization of the four seasons in the south of Italy. This collection is limited to 200 fountain pens only in each season. The flexible, custom designed 18-karat solid gold nib is available in Fine, Medium and Broad sizes.