The Platinum 3776 Century Oshino Fountain Pen combines a highly transparent AS resin body with Platinum's renowned 14K gold nib. Inspired by the crystal-clear waters of Oshino Hakkai, it features the Slip & Seal mechanism, includes a Platinum Converter 700A and delivers the precision and reliability of Japanese craftsmanship.
The Platinum 3776 Century Oshino Fountain Pen places transparency at the heart of its design. Crafted from highly transparent AS resin, both the barrel and cap reveal the pen's internal architecture, creating a clean and luminous appearance inspired by the crystal-clear waters of Oshino Hakkai, at the foot of Mount Fuji.
It is an excellent choice for writers who enjoy appreciating the inner workings of a fountain pen, value the precision of a Japanese gold nib, or wish to add one of the most distinctive editions of the renowned 3776 Century collection to their writing instruments.
The name Oshino comes from Oshino Hakkai, a group of eight spring-fed ponds located near Mount Fuji in the village of Oshino. Fed by underground water filtered naturally through volcanic rock, these ponds are celebrated throughout Japan for their exceptional clarity.
Platinum sought to recreate that same feeling of visual purity in this fountain pen. The transparent body reveals the feed, section, converter and internal components, while the rhodium-plated trim maintains a refined monochromatic appearance. The result is a writing instrument in which engineering itself becomes part of the design.
At Inktraveler, one of the details we appreciate most is how dramatically the appearance changes with each ink. Every colour introduced into the converter adds a completely new visual character to what begins as an entirely transparent fountain pen.
The Oshino is fitted with the large nib that defines the 3776 Century series, crafted from 14K gold with a rhodium-plated finish. Its silver appearance complements the clip and trim, reinforcing the pen's elegant transparent aesthetic.
The nib delivers the firm yet precise writing experience for which Platinum is renowned, offering excellent control while allowing the writer to feel the subtle interaction between nib and paper. It is particularly well suited to those who appreciate accurate, expressive handwriting.
Three nib sizes are available: Fine (F) for precise writing and small handwriting, Medium (M) for balanced everyday use, and Broad (B) for those who enjoy a wider line and greater ink expression.
As part of the 3776 Century family, the Oshino features Platinum's renowned Slip & Seal mechanism. This airtight inner cap significantly reduces ink evaporation, helping prevent the nib from drying out even after the pen has remained unused for extended periods.
The system helps preserve moisture inside the cap and ensures reliable starting performance after days or even weeks without use. It is particularly valuable for collectors and enthusiasts who regularly rotate between several fountain pens.
The Platinum 3776 Century Oshino uses Platinum's proprietary cartridge and converter filling system. It is supplied with a Platinum Converter 700A, allowing bottled ink to become an integral part of the pen's transparent appearance.
It is also compatible with Platinum ink cartridges, providing a convenient option for travelling or changing ink colours quickly. A Platinum ink cartridge is included so the pen is ready to write immediately.
To preserve the exceptional clarity of the transparent resin, only fountain pen inks should be used, and the pen should be cleaned regularly, particularly after highly saturated inks or colour changes.
The Platinum 3776 Century Oshino is supplied in its presentation box and includes:
• Platinum 3776 Century Oshino Fountain Pen
• Platinum Converter 700A
• Platinum Ink Cartridge
• Presentation Box
Product photographs are for illustrative purposes only. Minor variations may exist between the images shown and the actual product or package contents supplied by the manufacturer.
Is the pen completely transparent?
Yes. The barrel, cap and section are made from highly transparent AS resin, allowing most of the internal mechanism to remain visible.
Does it include a converter?
Yes. The pen is supplied with a Platinum Converter 700A for bottled fountain pen inks, together with one Platinum ink cartridge.
Which nib size should I choose?
Fine is ideal for precise handwriting, Medium offers an excellent balance for everyday writing, while Broad provides a wider line that better showcases ink colour and shading.
Does it accept standard international cartridges?
No. It is compatible only with Platinum proprietary cartridges and converters.
Is the nib made of steel?
No. The Oshino features a large 14K gold nib finished with rhodium plating.
Does the rhodium finish affect writing performance?
No. The rhodium plating changes only the appearance of the nib. The writing characteristics depend on the nib's design, adjustment and 14K gold construction.
Can transparent resin become stained?
Highly saturated inks may leave slight residue if left inside the pen for prolonged periods. Regular cleaning helps maintain the clarity of the barrel, section and converter.
Is it suitable for everyday writing?
Yes. Its 14K gold nib, Slip & Seal mechanism and versatile filling system make it an excellent choice for daily use as well as collecting.
• Brand: Platinum
• Collection: 3776 Century
• Model: Oshino
• General Reference: PNB-20000A
• Body Material: High-transparency AS resin
• Nib: Large 14K rhodium-plated gold nib
• Available Nib Sizes: Fine (F), Medium (M), Broad (B)
• Filling System: Platinum cartridge/converter
• Included Converter: Platinum Converter 700A
• Slip & Seal Mechanism: Yes
• Length: 139.5 mm
• Maximum Diameter: 15.4 mm
• Weight: Approximately 21.1 g
• Engraving Area: 10 × 35 mm
• Made in Japan
If you already own the Platinum 3776 Century Oshino, we would love to hear about your experience. Your comments regarding the nib, balance, filling system or transparent design may help other fountain pen enthusiasts choose the model that best suits their writing style.
You are also welcome to share your experience on Trustpilot. Every review helps other writers while encouraging us to continue improving our service.
Platinum Pen was founded in Japan in 1919 by Shunichi Nakata with the ambition of creating writing instruments that combine precision, reliability and genuine writing pleasure. From its earliest years, the company has focused on fountain pens while continuously developing technical innovations that improve everyday writing.
Platinum's philosophy blends traditional Japanese craftsmanship with a strong commitment to innovation. Throughout its history, the company has introduced filling systems, nibs, feeds and sealing mechanisms designed to solve practical challenges such as ink evaporation, nib drying and maintaining dependable writing performance after long periods of inactivity.
This philosophy gave rise to the original Platinum 3776 in 1978, developed with the collaboration of Haruo Umeda, widely known in Japan as Mr. Fountain Pen. Named after the 3,776-metre height of Mount Fuji, the model represented Platinum's ambition to create a fountain pen worthy of becoming a benchmark in Japanese writing.
The collection evolved further in 2011 with the introduction of the 3776 Century series, featuring improvements to the nib, feed and cap sealing system. The Oshino builds upon this technical foundation while introducing a transparent design inspired by the waters of Oshino Hakkai, creating a direct connection between Platinum's engineering expertise and one of Japan's most iconic landscapes.
The Platinum 3776 Century Oshino perfectly reflects this philosophy. Its transparency is far more than an aesthetic choice—it reveals the precision, functionality and craftsmanship that have defined Platinum for more than a century.
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The Platinum 3776 Century Oshino Fountain Pen combines a highly transparent AS resin body with Platinum's renowned 14K gold nib. Inspired by the crystal-clear waters of Oshino Hakkai, it features the Slip & Seal mechanism, includes a Platinum Converter 700A and delivers the precision and reliability of Japanese craftsmanship.
