Rare Square Case "ROLEX PERPETUAL BULGING BACK Ref.4643" Arrives. Sales Begin for a Rare 18K Rose Gold Model Tracing the Origins of the Early Perpetual Mechanism.

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Vintage watch select shop "PRINCIPE PRIVE - Epoca d’Oro" has started selling a rare 18K rose gold "ROLEX PERPETUAL BULGING BACK Ref.4643" with a distinctive square case. Manufactured in the 1950s, this model holds historical value from the early days of Rolex's automatic winding mechanism.

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Vintage watch select shop "PRINCIPE PRIVE - Epoca d’Oro" has started selling a rare 18K rose gold "ROLEX PERPETUAL BULGING BACK Ref.4643" with a distinctive square case. Manufactured in the 1950s, this model holds historical value from the early days of Rolex's automatic winding mechanism.

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Source: https://prtimes.jp/main/html/rd/p/000000834.000016079.html | Date: Date unavailable

ROLEX PERPETUAL BULGING BACK 18k Rose Gold 1950s PRINCIPE PRIVE - Epoca d’Oro, highly acclaimed by domestic and international watch collectors and fashionistas for its unique aesthetic selection of vintage watches from the 1940s to the 1990s, has acquired a ROLEX PERPETUAL BULGING BACK Ref.4643. In 1929, Rolex filed patent "144350" concerning automatic winding mechanisms. Subsequently, patent "160492" for the oscillating weight mechanism, and further patent "170803" filed in 1933, established the foundation for what would later be known as the “Bubbleback” structure. These mechanisms, designed to efficiently transmit the rotor's power to the mainspring, required height in their internal structure, resulting in the formation of a case back that bulged outwards. The Ref.4643, now in stock, is a model born from this early era of the Perpetual mechanism. ROLEX PERPETUAL BULGING BACK 18k Rose Gold 1950s A Model Inheriting the Structure from the Birth of the Bubbleback In 1933, Rolex unveiled the first Bubbleback. At that time, the automatic winding mechanism employed a unique rotor structure different from today's, and some individual pieces even had disassembly guide engravings for technicians on the inside of the case back. Subsequently, after the introduction of Caliber 620, the miniaturized Caliber 520 was born in 1936. Rolex continued to miniaturize movements while developing a variety of case designs. Our Ref.4643, which we are introducing today, is an extremely rare square-shaped model produced within this lineage. Ref.4643 Perpetual Bulging Back Ref.4643 was manufactured for only six years, from 1946 to 1952. It features an 18K solid rose gold case, boasting a deep hue and substantial weight. Despite its 28mm size, the unique sculptural quality of the square case gives it a presence greater than that of a round case. This timepiece is also equipped with a Perpetual mechanism, but unlike typical Bubblebacks, it adopts a “Bulging Back” structure with a convex case

Rare Square Case "ROLEX PERPETUAL BULGING BACK Ref.4643" Arrives. Sales Begin for a Rare 18K Rose Gold Model Tracing the Origins of the Early Perpetual Mechanism.

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