ShopWorn®- Gently Handled, Never Owned. Montegrappa NeroUno Duetto Ballpoint Pen, Gun Metal - ISNLDBAC. Montegrappa Nero Uno Duetto Black Resin and Steel Ballpoint. The item "Montegrappa NeroUno Duetto Ballpoint Pen, Gun Metal ISNLDBAC" is in sale since Monday, October 29, 2018. This item is in the category "Collectibles\Pens & Writing Instruments\Pens\Ballpoint Pens\Other Collectible Ballpoint".The seller is "shopworn" and is located in Cresskill, New Jersey. This item can be shipped worldwide.