Reference:Movements: Difference between revisions
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Two corrections: cal 1030 beat rate is 18,000 vph, not 18,800 (per research/entities/movements.yaml movement-cal-1030 and Reference:6552 / Reference:6610); and the Wind Vintage Perpetual Movement Part 2 article is by Charlie Dunne, not Eric Ku (per sources.yaml src-windvintage-perpetual-part2). |
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| <span id="cal-a260"></span>'''A260''' || automatic || 1953–55 || 19j · 18,000 vph · 36h || — || Submariner, Oyster Perpetual || First-generation Sub 6204 / 6205. 26.4mm; it as "non-butterfly" rotor (distinct from the butterfly-rotor 1030). Hodinkee reads A260 as "repurposed from earlier Oyster Perpetual models including later bubblebacks." | | <span id="cal-a260"></span>'''A260''' || automatic || 1953–55 || 19j · 18,000 vph · 36h || — || Submariner, Oyster Perpetual || First-generation Sub 6204 / 6205. 26.4mm; it as "non-butterfly" rotor (distinct from the butterfly-rotor 1030). Hodinkee reads A260 as "repurposed from earlier Oyster Perpetual models including later bubblebacks." | ||
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| <span id="cal-a296"></span>'''A296''' || automatic || 1952–55 || 18j · 18,000 vph · 36h || — || Submariner, Explorer, Oyster Perpetual || Big Crown 6200; Explorer 6098 / 6150 ("Precision") / 6350 (chronometer). 29.5mm. Full-rotor uni-directional Perpetual; the bumper attribution that briefly attached to A296 in earlier articles was dealer-copy contamination from bubble-back geometry confusion (Rolex never produced a bumper caliber). The 1030 that succeeds A296 introduces bidirectional winding via the butterfly rotor and a thinner autowind module — the thickness change is what eliminates the bubble-back caseback profile (Phillips Geneva Watch Auction FOUR lot 146 frames the A296→1030 swap explicitly as a thickness change; | | <span id="cal-a296"></span>'''A296''' || automatic || 1952–55 || 18j · 18,000 vph · 36h || — || Submariner, Explorer, Oyster Perpetual || Big Crown 6200; Explorer 6098 / 6150 ("Precision") / 6350 (chronometer). 29.5mm. Full-rotor uni-directional Perpetual; the bumper attribution that briefly attached to A296 in earlier articles was dealer-copy contamination from bubble-back geometry confusion (Rolex never produced a bumper caliber). The 1030 that succeeds A296 introduces bidirectional winding via the butterfly rotor and a thinner autowind module — the thickness change is what eliminates the bubble-back caseback profile (Phillips Geneva Watch Auction FOUR lot 146 frames the A296→1030 swap explicitly as a thickness change; Charlie Dunne, ''How Rolex Became Rolex: The Automatic Perpetual Movement Part 2'', Wind Vintage, 2023). | ||
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| <span id="cal-1030"></span>'''1030''' || automatic || 1950–62 || 25j · 18, | | <span id="cal-1030"></span>'''1030''' || automatic || 1950–62 || 25j · 18,000 vph · 42h || chronometer || Submariner, Explorer, Air-King, Oyster Perpetual || Rolex's first bidirectional automatic; butterfly rotor stamped ROLEX PERPETUAL PATENTED. 28.5 × 5.85mm. First appears on 6098 in 1952; runs across 6536 / 6536-1 / 6538 Submariners and 6610 Explorer. COSC and non-COSC versions on the same caliber. First Air-King appearance on 6552 (1953–57) | ||
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| <span id="cal-1036"></span>'''1036''' || automatic || 1954–59 || 25j · 18,000 vph · 42h || chronometer || GMT-Master || First GMT caliber; bakelite-bezel 6542 | | <span id="cal-1036"></span>'''1036''' || automatic || 1954–59 || 25j · 18,000 vph · 42h || chronometer || GMT-Master || First GMT caliber; bakelite-bezel 6542 | ||