Rolex 2 Register Chrono - Valjoux 23

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Hello, I am attempting to educate myself and would appreciate any input relative to the prospect of this dial/case and movements authenticity. I have attempted to compare it to images and illustrations and read a number of threads here and elsewhere, etc . The steel case back is stamped 3484. The crown has no markings.
I thought it might be a good investment, or addition to my collection
have asked the seller some questions via email but have yet to receive a response.