Lot of three Twsbi fountain pens, series "VAC... Lot 110

Lot of three Twsbi fountain pens, series "VAC 700", "Diamond 580" and "ECO", c.2012-2021. Lot of three Twsbi fountain pens, series "VAC 700", "Diamond 580" and "ECO", c.2012-2021. One, model "VAC 700 Clear" made in transparent resin and smoked black color in faceted section nozzle and butt. Truncated cone-shaped body and cap with silver metal details, matte finish clip and crown topped by cabochon with floating brand logo. Central band engraved with the name of the Taiwanese house and the series. Screw-down clasp. Vacuum loading system with improved valve to facilitate the filling process. Polished steel nib. Original case and user's manual included. In good condition. The base of the cap is damaged. Another "Diamond 580 AL Emerald Green" in transparent resin with piston mechanism and emerald green anodized aluminum nozzle, chrome metal details and crown topped by cabochon with floating logo of the brand. Central band engraved with the name of the Taiwanese house and the series. Screw-down clasp. Integrated plunger loading system. Polished steel nib. Original case and user's manual included. In good condition. It shows signs of use and ink residues. And another one, model "Eco Black" of cylindrical design with transparent resin body and black tonality in cap, butt and piston. Crown with logo of the brand in resin and clip and central band engraved with the name of the Taiwanese company and the series in chromed metal. Screw lock. Integrated plunger loading system. Polished steel nib. Original case, user's manual and elements for the maintenance of the filling mechanism. In good condition. Slight signs of use and traces of ink.