is a limited series where Alpha Sierra explores new directions in design, colour and functionality. Each model in this collection is produced in small numbers and represents a step in the evolution of our GMT men’s watches.

The Prototype Y watches combine a robust stainless steel case with a clean, legible dial and a functional GMT complication. Designed for everyday wear, but with enough character to stand apart from regular production models.

Within the Prototype Y Series you’ll find several variations, each with its own colourway and details, while sharing the same focus on build quality, balance and wearability. These watches are created for those who appreciate thoughtful design and the idea of owning something that won’t be widely repeated.