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| See also the [[Reference:bubbleback|Bubbleback family index]], [[Reference:Movements|movement reference]], [[Reference:Bracelets|bracelet & clasp guide]], and [[Reference:Serial-numbers|serial numbers by year]]. | | See also the [[Reference:bubbleback|Bubbleback family index]], [[Reference:Movements|movement reference]], [[Reference:Bracelets|bracelet & clasp guide]], and [[Reference:Serial-numbers|serial numbers by year]]. |
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| == Sources ==
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| * <code>src-antiquorum-1873-geneva-2024-lot282</code> — Antiquorum, Geneva, 9–10 November 2024, lot 282: Oyster Royal Chronometre, salmon "Scientifical" dial, case 100498, sold CHF 10,625
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| * <code>src-antiquorum-1873-hk-2021-lot233</code> — Antiquorum, Important Modern & Vintage Timepieces, Hong Kong, 25 April 2021, lot 233: Royal, flat back, steel, Extra Prima 17 jewels, case 48634
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| * <code>src-boettcher-prima-grades</code> — David Boettcher, "Prima, Extra Prima and Ultra Prima", vintagewatchstraps.com
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| * <code>src-hodinkee-bubbleback-collecting</code> — Hodinkee, "Buying, Selling, & Collecting: The Rolex Bubbleback And Why It Still Matters"
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| * <code>src-robbreport-bubbleback-collector-guide</code> — Robb Report, "A Collector's Guide to Rolex Bubbleback Watches, From 1931 to the 1950s"
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| * <code>src-antiquorum-2765-ny-2009-lot223</code> — Antiquorum, New York, 9 December 2009, lot 217: ref 2765, the near-contemporary manual flat-back Oyster
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| * <code>src-rolexforums-wvm-bubbleback-list</code> — RolexForums, "List of Bubbleback models" (user w-v-m), the circulating list that files 1873 as a Bubbleback
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| == Sources == | | == Sources == |