Caja Ultrafina V2 Royal Oak Oro Rosa para Seiko Mod – 37 mm NH35/NH36/NH72

What Inspires This Case

The Rose Gold Royal Oak 37mm Seiko Mod Case was developed as a warmer take on the classic Seikoak design language. Most Seiko Royal Oak mods focus on steel or gunmetal finishes, but we wanted to create something that stands out without losing the clean geometry of the original shape. The brushed rosegold surface softens the industrial lines, while the polished edges add depth — giving the whole case a subtle, jewelry-like quality that changes with the light.

This case was designed specifically for Seiko modders building Seikoak Mods who appreciate proportion, texture, and balance. It keeps the same integrated-lug architecture and sharp facet transitions, but introduces a softer tone that pairs beautifully with skeleton dials, brown or champagne faces, and gold-accented hands.

Why 37mm Is Perfectly Proportioned

The 37mm Seikoak case size came after months of experimenting with different dial-to-case ratios. With 28.5mm OEM Seiko dials, this dimension felt the most natural — the dial sits centered, the rehaut alignment is clean, and the watch carries the same balanced stance as vintage Royal Oak references.

For Seiko modding, 37mm offers the right mix of visual proportion and technical compatibility. It wears comfortably on most wrists, keeps the lines tight, and allows NH35, NH36, and NH72 builds to maintain proper spacing and depth. It’s not oversized or bulky — just a compact, well-measured foundation for any Seiko Royal Oak mod project.