Postalco Three Pen Case Cobalt Blue

The Postalco Three Pen Case in Cobalt Blue is a handcrafted leather pen case from Japan, designed for precisely two to three writing instruments—no more, no less. Outside, the characteristic crossgrain leather with an embossed line pattern; inside, calf leather and pig suede lining: three leather types that age together and develop their own patina over time. The solid brass snap fastener sits securely, and the Cobalt Blue presents itself as a cool, saturated blue with depth.

Features

• Crossgrain leather exterior: The embossed cross-line pattern is not just visually distinctive—it allows everyday wear marks to blend in organically rather than stand out. Full-grain beef leather, vegetable-tanned with mimosa tannins, made without chromium salts.
• Calf leather interior: The soft, smooth inner surface sits comfortably against your pens and protects lacquered or anodised finishes from abrasion.
• Pig suede lining: Fine-pored, smooth-gliding, and durable—pens slide in and out easily without the lining fraying over time.
• Solid brass snap fastener: Milled from solid brass with an engraved fine-line pattern reminiscent of a fingerprint's texture. Brass develops a patina over time—that's intentional.
• Wide opening: The case is constructed so that it opens fully, allowing direct access to each individual pen.
• Aniline dyeing: The natural colour and surface variations of the leather are preserved—no synthetic top coat that would flatten the feel.
• Single-pocket design: Deliberately simple: one pocket, no dividers, no zip—keeping the case slim and flat in any bag.

Use & Tips

• Fountain pens: Particularly suitable for piston fillers or converter fountain pens with a diameter of up to approximately 14 mm. The soft pig suede lining protects lacquer and gilded decorative elements.
• Ballpoints and gel rollers: Slender models fit easily two or three at once; wider triangular grips may limit capacity to two pens.
• Nibs and thin pencils: Thanks to the single pocket without dividers, you can also lay nibs or carpenter's pencils flat.
• Keep leather dry: If wet, gently blot and air-dry—avoid direct heat sources. When the surface feels dry, treat sparingly with colourless leather care, testing first on an inconspicuous area.
• Plan for patina: Aniline-dyed leather changes with light and use—Cobalt Blue will deepen and become more individual over time. This isn't a flaw; it's the design principle.
• Possible colour transfer: As with all aniline-dyed leathers, light colour transfer to pale fabrics may occur in wet conditions or with strong friction.

For Leather Enthusiasts

The crossgrain leather is full-grain beef leather (steerhide)—a material traditionally used for durable everyday objects because of its thickness and strength. Vegetable tanning with mimosa tannins is more time-consuming than chrome tanning, but it produces leather that absorbs moisture and oils from your skin, developing an individual patina rather than repelling them with a pigment layer. The embossed cross-line pattern emerged as a design response to precisely this effect: the geometric structure breaks light reflection so that scratches visually blend into the pattern. All three leather components—crossgrain exterior, calf interior, pig suede lining—age in their own way and together create a case that gains character with use.

Technical Specifications