ROLEX Oyster Perpetual ”ENGIN FIX BEZEL” Spear Hour-Makers

In 1932, the introduction of self-winding mechanisms marked a significant evolution in watchmaking. It was Rolex that established this system as a foundation for modern timepieces.

By the 1940s, automatic movements began to carry size designations. Starting with the 620NA and evolving into the final Bubbleback form with the 630NA, development continued into 1950 with the A260 (Cal. 645), followed by the A296 (Cal. 745), forming what is now referred to as the semi-Bubbleback structure.

That same year saw a major technical shift—from unidirectional winding to bidirectional winding. This advancement led to the creation of Caliber 1030, which would become the basis for Rolex’s future automatic movements.

 Despite this, the earlier Cal. 645 and 745 remained in production until around 1955. While the exact reason is unclear, these calibers featured advanced specifications, including adjustment in multiple positions and swan-neck regulators, reflecting a high level of technical refinement.

It is also possible that Rolex did not immediately place full confidence in the newer architecture of the 1030, which introduced a different balance design with regulating screws.

Caliber 1030 would go on to power numerous iconic models, including the Submariner 6538 and Turn-O-Graph 6556. However, its significance is equally tied to non-Oyster models.

Among these, Ref. 6564 and 6567 stand as key examples, with Ref. 6569 adding further importance through its diverse dial variations. These models are often compared to the manually wound Ref. 6422 and remain highly regarded.

The applied “ROLEX” logo seen between 1950 and 1959 represents a distinct mark of status from the period.

Additionally, the spear-shaped hour markers unique to these non-Oyster references introduce a sculptural quality, elevating the design beyond pure function.

Positioned as a precursor to the Ref. 1007, the presence of a fixed engine-turned bezel further enhances the identity of this piece.

A configuration that reflects both technical transition and design maturity.

- wrist size in our picture is 17cm circumference -