The Cornerstone

The Cornerstone is a core piece in the Foundation series — built from firm, dependable Buttero leather into an everyday structured pen case. Its rectangular form holds its shape whether tucked in a bag or set on a desk — a commitment to durable basics. Every structural seam is joined by hand with saddle stitching, so it stays crisp and upright, open or closed.

• Fully hand-stitched with saddle stitching, holding its shape open or closed
• Smooth zip closure; interior fits pens, rulers, erasers, and other stationery
• Thick Buttero vegetable-tanned leather that develops more sheen and texture with use

Customization

Engraving

Free engraving of a name or short phrase (up to 20 characters); beyond 20 characters, please contact us — an extra fee applies.

Symbols / Designs

Have a special symbol or design in mind? Let us know and we'll do our best to make it happen (additional fee depending on complexity).

Add-ons

Color-Branded Engraving, Monogram

Please Note

To keep production efficient, if details such as font style, placement, or colour aren't specified at checkout, we'll use our best judgement to match the piece's style — please note any special requests clearly in the order notes.

Note

New 2025 font styles now available; each symbol has a fixed, individual size — we recommend confirming feasibility with us before ordering.

Reference photos:

字款 Font Styles（3款）顏色燙字 Color Branded Fonts（10色）符號參考 1–64符號參考 65–102符號參考 103–113符號參考 114–120

Packaging

We believe packaging is more than protection — it's an extension of the design. Every piece comes with the following, so it feels considered whether it's a gift or a treat for yourself:

• Architectural Kraft Gift Box：An industrial-style rigid box, hand-tied with natural jute twine and a debossed leather tag.
• Leather Certificate of Origin：Comes with a dedicated certificate noting the leather's origin and certification, affirming handcrafted quality.
• Care Guide：A care guide in a textured black envelope, so you can keep your piece in its best condition with confidence.
• Hand-Marbled Wax Seal：Every wax seal is hand-mixed by our craftsman, giving each one a unique marbled texture as the final mark of authenticity.
• Branded Cotton Dust Bag：Made from natural cotton and linen, for easy everyday storage and surface protection.
• Custom Grey Tissue Paper：Wrapped inside with hykc-branded tissue paper, so every layer carries the same architectural aesthetic.