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CAL. 7740 Heuer/Valjoux Movment dokuments/Infos?

hello to all heuer lovers , does anyone know where i can get the technical information or working-dokuments for the very rare movment 7740. It wose based on a valjoux caliber but has a heuer-buren chrono top on it too. On with valjoux movment is the base built on ?It wose with data too? or only 3 registers? Has anybody a link or a technical manual that i can copy, i will pay for the cost of course.
Thanks for any help, greetings from Germany
Jasper Bitter

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