Reference:2574: Difference between revisions

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The 2574’s 9¾-ligne 17-jewel manual movement is a member of the pre-Perpetual Rolex small-caliber family that Aegler supplied to Rolex through the 1930s. Rolex’s period naming for these calibers is inconsistent across documentation. Modern collector references use caliber numbers (9¾’’‘, 10½’’’ Hunter, Cal. 59, Cal. 710) that were applied variably at the factory and on movement signatures. What is consistent on the 2574 is the specification: 17 jewels, straight-line lever escapement, monometallic balance with Rolex’s Superbalance designation, a self-compensating Breguet overcoil hairspring, and a center-seconds layout with a sweep second hand running off the same cannon-pinion as the hour and minute. The movement is rhodium-plated. Plates are signed with the Rolex wordmark and, on surfaced examples, the Superbalance text.

Sweep seconds is the architectural point of interest. Most pre-war Rolex manual Oysters run sub-seconds at 6 o’clock; the sweep-seconds layout on the 2574 is less common and produces a cleaner dial without a subsidiary register cut into the lower face. The trade-off is mechanical. Driving a sweep seconds hand off the center axis requires a different geartrain arrangement than a sub-seconds layout, and period sweep-seconds movements of this size are sometimes slightly less ~~robust~~ in service than their sub-seconds siblings. In practice, surviving 2574s that have been properly serviced keep acceptable time by vintage-watch standards; reports of persistent timekeeping problems on specific examples tend to trace to service history rather than to the movement design.

Sweep seconds is the architectural point of interest. Most pre-war Rolex manual Oysters run sub-seconds at 6 o’clock; the sweep-seconds layout on the 2574 is less common and produces a cleaner dial without a subsidiary register cut into the lower face. The trade-off is mechanical. Driving a sweep seconds hand off the center axis requires a different geartrain arrangement than a sub-seconds layout, and period sweep-seconds movements of this size are sometimes slightly less durable in service than their sub-seconds siblings. In practice, surviving 2574s that have been properly serviced keep acceptable time by vintage-watch standards; reports of persistent timekeeping problems on specific examples tend to trace to service history rather than to the movement design.

There is no shock protection in any meaningful modern sense. Incabloc and KIF shock systems arrived at Rolex with the A.296 caliber of the late 1940s. The 2574 predates that development and its Superbalance is a stability design, not a shock-protected balance. Wearers of vintage 2574s should treat the watch as a pre-shock-protection piece: reasonable care, no sport wear, no accidental impacts.

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 The 2574’s 9¾-ligne 17-jewel manual movement is a member of the pre-Perpetual Rolex small-caliber family that Aegler supplied to Rolex through the 1930s. Rolex’s period naming for these calibers is inconsistent across documentation. Modern collector references use caliber numbers (9¾’’‘, 10½’’’ Hunter, Cal. 59, Cal. 710) that were applied variably at the factory and on movement signatures. What is consistent on the 2574 is the specification: 17 jewels, straight-line lever escapement, monometallic balance with Rolex’s Superbalance designation, a self-compensating Breguet overcoil hairspring, and a center-seconds layout with a sweep second hand running off the same cannon-pinion as the hour and minute. The movement is rhodium-plated. Plates are signed with the Rolex wordmark and, on surfaced examples, the Superbalance text.
-Sweep seconds is the architectural point of interest. Most pre-war Rolex manual Oysters run sub-seconds at 6 o’clock; the sweep-seconds layout on the 2574 is less common and produces a cleaner dial without a subsidiary register cut into the lower face. The trade-off is mechanical. Driving a sweep seconds hand off the center axis requires a different geartrain arrangement than a sub-seconds layout, and period sweep-seconds movements of this size are sometimes slightly less robust in service than their sub-seconds siblings. In practice, surviving 2574s that have been properly serviced keep acceptable time by vintage-watch standards; reports of persistent timekeeping problems on specific examples tend to trace to service history rather than to the movement design.
+Sweep seconds is the architectural point of interest. Most pre-war Rolex manual Oysters run sub-seconds at 6 o’clock; the sweep-seconds layout on the 2574 is less common and produces a cleaner dial without a subsidiary register cut into the lower face. The trade-off is mechanical. Driving a sweep seconds hand off the center axis requires a different geartrain arrangement than a sub-seconds layout, and period sweep-seconds movements of this size are sometimes slightly less durable in service than their sub-seconds siblings. In practice, surviving 2574s that have been properly serviced keep acceptable time by vintage-watch standards; reports of persistent timekeeping problems on specific examples tend to trace to service history rather than to the movement design.
 There is no shock protection in any meaningful modern sense. Incabloc and KIF shock systems arrived at Rolex with the A.296 caliber of the late 1940s. The 2574 predates that development and its Superbalance is a stability design, not a shock-protected balance. Wearers of vintage 2574s should treat the watch as a pre-shock-protection piece: reasonable care, no sport wear, no accidental impacts.