Rolex Oyster 3121

A manually-wound “boy’s size” Oyster from the late 1930s/early 1940s, often seen with “Royal” or “Firefly” branding. Its historical significance lies in its role as a foundational model that brought the promise of a waterproof, durable watch to a wider audience in a smaller, more accessible package. This reference was crucial in building mainstream consumer trust in the Oyster concept, proving its versatility beyond just professional use and helping to establish Rolex’s reputation for everyday reliability.