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| The third is the lesson about daily use. The Hermetic is the counter-example that justified the Oyster. Wilsdorf commissioned the Perregaux-Perret screw-down crown, the Spillmann three-piece case, and the Aegler movement integration because the Finger double case, however waterproof, had made itself a daily annoyance. The Oyster is what a watchmaker builds after three years of selling Hermetics and learning what the customer actually wants. Without the 3666, there is no Oyster; with the 3666, the Oyster is inevitable. | | The third is the lesson about daily use. The Hermetic is the counter-example that justified the Oyster. Wilsdorf commissioned the Perregaux-Perret screw-down crown, the Spillmann three-piece case, and the Aegler movement integration because the Finger double case, however waterproof, had made itself a daily annoyance. The Oyster is what a watchmaker builds after three years of selling Hermetics and learning what the customer actually wants. Without the 3666, there is no Oyster; with the 3666, the Oyster is inevitable. |
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| <span id="still-open"></span>
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| == Still open ==
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| <span id="the-full-hermetic-catalog"></span>
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| === The full Hermetic catalog ===
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| The 3666 is the best-documented of the Rolex Hermetic references, but it is not the only one. Period Rolex catalogs list Hermetic variants in multiple case materials and sizes, and the complete reference catalog for the Hermetic line has not been published in modern collector literature. Surfaced examples are consistent with a multi-reference catalog spanning silver, 9ct gold, 18K gold, and mixed-metal cases across ladies' and men's sizes. Systematic cross-referencing of surfaced cases against period Rolex dealer documents remains to be done.
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| <span id="production-totals"></span>
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| === Production totals ===
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| No production-total figure has been surfaced for the 3666 or for the Hermetic line overall. Finger's workshop at Longeau was small, and the patent monopoly means every Hermetic case passed through that single supply chain. The total for the entire Hermetic catalog is likely low four digits across all references and materials, but this is inference from the small surviving corpus rather than documented production figures. The Jean Finger firm's records, if they survive, would settle the question; they have not surfaced in published sources.
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| <span id="the-gb-197208-ch-89276-question"></span>
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| === The GB 197208 / CH 89276 question ===
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| The relationship between Wilsdorf's British patent and Finger's Swiss patent is documented by Boettcher at [https://www.vintagewatchstraps.com/blogoystercase.php vintagewatchstraps.com] as an ownership ambiguity. Whether Wilsdorf paid Finger a license fee, purchased rights under a private agreement, or simply filed a British counterpart without Swiss licensing is not recorded in the surfaced primary sources. The fact that all surviving cases carry Finger's patent number and initials suggests some form of acknowledged licensing arrangement, but the commercial terms are unknown.
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| <span id="the-wilsdorf-alternate-brands"></span>
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| === The Wilsdorf alternate brands ===
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| Wilsdorf marketed Hermetic architecture under several brand names in parallel with Rolex (Aqua, proto-Oyster-era experiments, and retail-channel-specific brands that surface occasionally in dealer listings). The exact roster of alternate Hermetic brands, and their relationship to the Rolex Submarine catalog, is not fully documented. This reflects a general feature of early Wilsdorf retail strategy: multiple brands, shared supply chain, retail-channel segmentation. The pattern applies to the Hermetic era as much as to the contemporary Oyster and Rolco output.
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| == Sources == | | == Sources == |