Recently acquired watch, looking for some help

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dear all,
these are my first Heuer watch i bought only yesterday from an old collector. i'm not 100% sure on them and i have no info about them at all. could you please help me identify the year/model/value maybe? many thanks in advance.

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Hello. You have a Heuer Reference 3645, which is a gold-plated model with the Valjoux 92 movement. Your has second generation hands from the mid-late 1960s.

Very nice watch!
 
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many thanks for your help. what is the current market value please? i might sell them - but it seems prices of these watch went above the roof so don't wan't to set it badly. many thanks, great forum!
 
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i've been corrected that these are the 7725 models with Valjoux 7730. seems like there were too many of these small differences..completely alien to me 😉