Reference:6536-1: Difference between revisions

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==Movement notes==

Caliber 1030 is confirmed across the 6536/1 corpus. Specifications: 25 jewels, 18,800 vph, ~42-hour reserve, 28.5 × 5.85mm, monometallic balance, blue Breguet overcoil. The 1030 is Rolex's first bidirectional automatic, introduced in 1950 — the architecture that ~~replaced~~ the ~~bumper movements~~ of the ~~earliest~~ Submariners. The butterfly rotor is stamped ROLEX PERPETUAL PATENTED.

Caliber 1030 is confirmed across the 6536/1 corpus. Specifications: 25 jewels, 18,800 vph, ~42-hour reserve, 28.5 × 5.85mm, monometallic balance, blue Breguet overcoil. The 1030 is Rolex's first bidirectional automatic, introduced in 1950 — the butterfly-rotor architecture that succeeds the thicker uni-directional A-series Perpetuals (A260 / A290 / A295 / A296) of the early Submariners. The A-series itself is full-rotor, not bumper; Rolex never produced a bumper caliber. The butterfly rotor is stamped ROLEX PERPETUAL PATENTED.

Chronometer-certified (OCC) and non-certified versions both exist within the 6536/1 family on the same base caliber. The split is a certification distinction, not a mechanical one — some movements were sent for chronometer rating and some were not. The Sotheby's December 2018 lot 252 caseback is stamped 6536/1 with III.57 (third quarter 1957) on a chronometer-rated four-line dial example; non-chronometer 6536/1 examples surface across the same period with the standard two-line dial.

@@ Line 85: / Line 85: @@
 ==Movement notes==
-Caliber 1030 is confirmed across the 6536/1 corpus. Specifications: 25 jewels, 18,800 vph, ~42-hour reserve, 28.5 × 5.85mm, monometallic balance, blue Breguet overcoil. The 1030 is Rolex's first bidirectional automatic, introduced in 1950 — the architecture that replaced the bumper movements of the earliest Submariners. The butterfly rotor is stamped ROLEX PERPETUAL PATENTED.
+Caliber 1030 is confirmed across the 6536/1 corpus. Specifications: 25 jewels, 18,800 vph, ~42-hour reserve, 28.5 × 5.85mm, monometallic balance, blue Breguet overcoil. The 1030 is Rolex's first bidirectional automatic, introduced in 1950 — the butterfly-rotor architecture that succeeds the thicker uni-directional A-series Perpetuals (A260 / A290 / A295 / A296) of the early Submariners. The A-series itself is full-rotor, not bumper; Rolex never produced a bumper caliber. The butterfly rotor is stamped ROLEX PERPETUAL PATENTED.
 Chronometer-certified (OCC) and non-certified versions both exist within the 6536/1 family on the same base caliber. The split is a certification distinction, not a mechanical one — some movements were sent for chronometer rating and some were not. The Sotheby's December 2018 lot 252 caseback is stamped 6536/1 with III.57 (third quarter 1957) on a chronometer-rated four-line dial example; non-chronometer 6536/1 examples surface across the same period with the standard two-line dial.