TWSBI FOUNTAIN PEN - DIAMOND 580 RBT Stub 1.1
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SKU Code: M7446090
TWSBI FOUNTAIN PEN - DIAMOND 580 RBT Stub 1.1
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The TWSBI Diamond 580 RBT Fountain Pen is a distinguished and beautifully crafted writing instrument that elevates the everyday act of writing into an experience of grace, precision, and personal expression. Designed for those who appreciate thoughtful engineering and timeless aesthetics, this pen strikes a remarkable balance between performance and visual appeal. With its refined finish, dependable mechanics, and smooth writing performance, the Diamond 580 RBT brings joy — whether you are journaling intimate thoughts, drafting professional documents, or capturing creative ideas.
The RBT edition introduces a unique colorway and finish that sets it apart with subtle elegance and sophistication. Its semi-transparent, richly toned barrel offers glimpses of the intricate mechanism inside, creating a visually engaging blend of form and function. The polished trim and accents enhance the pen’s overall presence, harmonizing effortlessly with the barrel’s refined tones. The design evokes both contemporary style and classic sensibilities, making it a versatile choice for a wide range of writing environments — from professional desks to creative spaces.
At the heart of this pen lies the hallmark high-capacity piston filling system, a defining feature of the Diamond 580 series. This mechanism allows the pen to draw ink directly from a bottle with a smooth twist, offering a generous ink reservoir that supports extended writing without frequent refills. The consistent and reliable ink flow ensures that every stroke — whether bold or delicate — feels effortless and controlled. The demonstrator-inspired body also allows you to monitor your ink level as you write, making it both a practical and engaging writing tool.
Comfort and precision are integral to the Diamond 580 RBT’s design. The machined aluminum grip section is ergonomically shaped to offer a secure and comfortable hold, allowing for relaxed, fluid writing even during long sessions. Carefully balanced weight distribution enhances usability, giving the pen a natural feel in hand that encourages confidence and ease. The stainless steel nib glides smoothly over paper, delivering consistent ink flow and dependable performance across a variety of writing tasks. Available in multiple nib sizes — from Extra Fine to Broad and including a 1.1 mm Stub — this pen can be customized to suit your unique handwriting style and expressive intent.
Beyond its striking appearance and exceptional performance, the Diamond 580 RBT is designed for longevity and ease of care. The pen can be fully disassembled for deep cleaning and maintenance, ensuring it remains a trusted writing companion for years. Its durable construction and thoughtfully engineered components support both novice users discovering the pleasures of fountain pen writing and seasoned enthusiasts seeking a reliable daily writer.
At mygift.in, we believe that meaningful writing deserves a pen that matches both substance and style. The TWSBI Diamond 580 RBT Fountain Pen exemplifies this philosophy, offering an elegant blend of design, performance, and lasting value. By choosing this pen from mygift.in, you are investing in an instrument that transforms ordinary writing into an intentional, expressive, and deeply enjoyable experience.
Product Information
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Model: TWSBI Diamond 580 RBT Fountain Pen
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Pen Type: Fountain Pen
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Colour / Finish: RBT (Refined barrel tone with polished metallic trim)
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Origin: Taiwan
Design & Build
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Barrel Material: Transparent Resin / Aluminum
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Cap Type: Screw-on cap with secure seal
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Design Style: Demonstrator-inspired with visible ink chamber
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Trim/Accent: Polished metallic accents
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Grip Section: Machined aluminum for ergonomic and secure hold
Nib & Writing Performance
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Nib Material: Stainless Steel
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Nib Sizes Available:
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Extra Fine (EF)
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Fine (F)
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Medium (M)
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Broad (B)
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1.1 mm Stub
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Writing Quality: Smooth, consistent ink flow suitable for everyday writing, journaling, note-taking, and professional use
Filling System
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Filling Mechanism: High-capacity piston filling system
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Ink Source: Bottled ink (direct fill)
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Approx. Ink Capacity: 1.7–1.8 ml
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Cartridge/Converter: Not required
Dimensions & Weight
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Length (Closed): Approx. 139 mm
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Length (Posted): Approx. 167 mm
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Weight (Empty): Approx. 25 g
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Body Material: Resin / Aluminum
Additional Features
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Fully Disassemblable: Yes (for deep cleaning and maintenance)
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Ink Monitoring: Demonstrator-style barrel allows easy ink level visibility
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Comfort: Balanced weight and ergonomic design for extended writing sessions







